Space Microbiology: Modern Research and Advantages for Human Colonization on Mars

4 This work is licensed under Creative Commons Attribution 4.0 International License.
ISSN: 2349-8889
Volume-6, Issue-4 (July 2019)
https://doi.org/10.31033/ijrasb.6.4.2
International Journal for Research in
Applied Sciences and Biotechnology
www.ijrasb.com
Space Microbiology: Modern Research and Advantages for Human
Colonization on Mars
Deep Dey
Student, MBBS (2nd
year), Midnapore Medical College & Hospital, West Bengal, INDIA
Corresponding Author: deepdey4780@gmail.com
ABSTRACT
Astromicrobiology or exomicrobiology, is the study
of microorganisms in outer space. Microorganisms in outer
space are most wide spread form of life on Earth, and are
capable of colonising any environment, this article usually
focus on microbial life in the field of astrobiology.
Microorganisms exhibit high adaptability to extreme
environments of outer space via phenotypic and genetic
changes. These changes may affect astronauts in the space
environment as well as on earth because mutant microbes
will inevitably return with the spacecraft. In this article, the
advantages and disadvantages of microbes in outer space
are discussed. We all know that outer space is extreme and
very complex environment, microorganisms readily adapt to
changes in environmental variables, such as weightlessness,
cosmic radiation, temperature, pressure and nutrient levels,
and these microorganisms exhibit a variety of morphological
and physiological changes. Space conditions may
significantly increase the mutation frequency of certain
genes in microorganisms, which could allow the cultivation
of the bacterial mutants, followed by screening of the
bacteria for large scale production. Also we can extract
microbial secondary metabolites as medicine, flavouring and
nutritional drugs. This article provides the planetary
exploration and also provides the microbial observatory
program on ISS. The aim of this article will also help us to
determine the benefits of bacteria and other microorganisms
in case of “Human colonization on Mars”.
Keywords-- The ISS as a Microbial Observatory,
Planetary Exploration, Discoveries, Experiments,
Microbes Tested in Outer Space, Extremophiles,
Antibiotic and Food Production in Outer Space, Alcohol
Production by Bacteria in Outer Space, Changes in
Bacterial Invasion, Changes in Bacterial Adaptability in
Environment, Changes in Antibiotic Resistance,
Advantages of Space Microbiology for Human
Colonization on Mars, Benefits on Microbial Observatory
on ISS, and Multipurpose Facilities Available on ISS.
I. INTRODUCTION
The microbial ecosystems on the International
Space Station are no different. Some microbes were
inhabitants from the time station was assembled. Some
join each time a new crew member or payload arrives.
People, their habits, their physiological reactions to their
emotional states, and their physical environment are all
variable that have the potential to continue to alter
microbe systems on the space station. With the potential
to affect future space exploration missions, researchers
founded by Human research program plan to gather and
analyze biological samples to study better the micro-
biome of the space station, the ever changing microbe
environment that can be found on the space station. The
vast cold and radiation filled conditions of outer space
present an environmental challenge for any form of life.
The biosphere of Earth has evolved for more than 3
billion years, shielded by protective blanket of the
atmosphere protecting terrestrial life from the hostile
environment of the outer space (Clement et al). Recently
space technology provide the opportunity to expose
microorganisms intentionally to the harsh external
environment or selected parameter of it. Owing to the
limitations of space flight time, specific environmental
conditions and other uncontrollable factors,
implementation of space ship based experimental
research is more difficult. To overcome this weakness,
terrestrial laboratory facilities are designed to stimulate
parameters of outer space, such as rotator cell culture
systems, parabolic flight stimulation and diamagnetic
levitation. Researchers have recognized that the ground
based stimulation of conditions such as microgravity and
ionizing radiation only imitates the real space
environment in a limited manner for the microbes being
analyzed (Horneck et al). the short generation time of
microorganisms makes them uniquely suited for studies
assessing responsible to ―altered environmental
conditions‖. Microbial cells were among the first Erath
based life forms to be sent into microgravity environment
of space. These early investigations established that
bacteria and fungi remained viable and capable of
reproducing while also setting a precedent for conducting
research in the space flight microgravity environment.
Although more than 100 spaceflight experiments
involving microorganisms have been conducted over the
past 50 years, significant gaps in our knowledge as to
how this environment impact microbial ecology,
microbial genotypic and phenotypic characteristics, ad
host microbe interaction remain (L. Castro et al).
II. THE ISS AS MICROBIAL
OBSERVATORY
The original concept of microbial observatories
as stated by United States of National Foundation was to

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study and understand microbial diversity over time and
across environmental gradients. A key element of
diversity studies is to seek out information about
previously unidentified microbes in the various
environments in which an observatory is
established(Coris et al). The ISS is an excellent
experimental system for studying changes in diversity
over time under controlled conditions. The establishment
of a microbial observatory program on ISS to conduct
long term, multigenerational studies of microbial
population dyanamics (Burge et al).The development of a
research program aimed at demonstrating the roles of
microbial plant system in long term life support systems.
This program, previous space flight and ground based
space flight analogue researches has established that
even microorganisms, the smallest earth based life forms,
are intrinsically able to respond to changes in this
force(Dickson et al 1991). Microgravity as a research
tool, coupled with current molecular technology provides
researchers the opportunity to establish how variations in
this physical force affect microbial life at cellular,
molecular and evolutionary levels (Apollo, medical
concerns and results,1969).
II. 1 Multiputpose Facilities Available on the ISS: There
are many multipurpose facilities available on the ISS
which helps in microbial observatory program. Their
short explanation are given below:
Biological Experiment Laboratory (Bio Lab): Bio lab
Includes an incubator, microscope, spectrophotometer,
glove box, freezer units, and two centrifuges to simulate
the effects of gravity. A variety of hardware existing
inserts and containers for microbiological
experimentation are available through the primary
European Space Agency (ESA) contractor Astrium
(www.astrium.eads.net).
Bio Culture System (BIOS): The NASA Bio culture
System is an advanced space bioscience culturing system
capable of supporting variable duration and long duration
experiments on the ISS. BIOS provides the ability to
culture mammalian and non-mammalian cells and will
allow for investigations into host-pathogen interactions.
European Drawer Rack (EDR): EDR supports seven
Experiment Modules (EMs), each with independent
cooling, power, and data communications as well as
vacuum, venting, and nitrogen supply, if required.
European Modular Cultivation System (EMCS): EMCS
allows for cultivation and stimulation of biological
experiments under controlled environmental conditions
(e.g. temperature, gas, water supply and light). The
EMCS has two centrifuges that can spin at 0 to 2 times
Earth’s gravity.
Expedite the Processing of Experiments for Space
Station Racks (EXPRESS Racks): EXPRESS Racks is a
multipurpose payload rack systems that provide structural
interfaces, power, data, cooling, water, and other items
needed to operate microbiological experiments in space.
Image Processing Unit (IPU): The IPU receives,
records, and downlinks experiment image data for
experiment processing. The IPU is housed in the Ryutai
(fluid) experiment rack.
Light Microscopy Module (LMM): The light imaging
microscope that takes digital images and videos across
many levels of magnification using standard Leica
objective lenses. It is capable of high resolution black and
white microscopy, bright f ield, epifluorescent and
fluorescent techniques.
Microgravity Science Glove box (MSG): The MSG is a
contained work environment for research with liquids and
hazardous materials. It is equipped with a front window,
built-in gloves, video system and data downlinks allow
for monitoring enclosed experiments from the ground.
Nano Racks: Nanoracks contains optical and reflective
microscopes with digital image retrieval for ISS
experiments. A NanoRacks Plate Reader is also available
to monitor samples in micro titer plates with 96 wells
with controls for temperature and stirring. Saibo Rack:
Saibo rack contains the
Cell Biology Experiment Facility (CBEF) and Clean
Bench (CB): CBEF is an incubator with a micro-G
compartment and a1G compartment equipped with small
centrifuge. CB is a glove box with a HEPA filter and
high-performance optical microscope.
III. PLANETARY EXPLORATION
The search for extraterrestrial microbial life have
focused mostly on Mars due to trhe promising
environment and close proximity ;however, other astro
biological sites include the moons Europa, Titan and
Encela dus(Davila et al). All of this sites currently have
or had a recent history of processing liquid water, which
scientists hypothesize as the most consequential precursor
for biological life. Europa and Encedalus appear to have
large amounts of liquid water hidden beneath the layers
of ice that covers theirs surfaces. Titan , on the other
hand, is only planetary body besides Earth with liquid
hydrocarbons on surface(Burdge et al). Mars is the main
area of interest for the search for life primarily
(Astronomic biology,10th
Sep,2010).
III. 1. Discoveries: So far, the search for microbial life in
extra terrestrial locations have been less than successful.
The first of such attempts, occurred through Viking
program (NASA-1970s), in which two Mars landers were
used to conduct experiments that searched for bio
signatures of life on Mars. The landers utilized robotic
arms to collect soil samples into sealed containers that
were brought back to earth. The results were largely
inconclusive, although some scientists still dispute them.
In 2008, Russian cosmonauts reported findings
of sea plankton living on the outside sea surfaces of the
ISS windows. They have yet to find explanations for the
discovery, but it seems to have been a result of human
contamination, though this may never been proven.

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III. 2. Experiments: Many experiments have been done
on earth and space.
Earth: Many studies on earth have been conducted to
collect data on the response of terrestrial microbes to
various stimulated environmental conditions of outer
space. The response of microbes such as viruses,bacterial
cells, bacteria and fungal spores and lichens, to isolated
factors of outer space were determined in space and
laboratory stimulation experiments. In general
microorganisms tended to thrive in the stimulated space
flight environment – subjects showed symptoms of
enhanced growth and uncharacteristic ability to
proliferate despite the presence of normally successive
levels of antibiotics. The mechanisms responsible for
explaining this enhanced responses have yet to
discovered (Burge et al).
Space: The ability of microorganisms to survive in an
outer space environment was investigated to approximate
upper boundaries of the biosphere and to determine the
accuracy of the interplanetary transport theory for
microorganisms. Among the investigated variables solar
UV radiation had the most harmful effect on microbial
samples. Among all the samples, only lichens (
Rhizocarponsp and Xanthoria sp) fully survived the 2
weeks of exposure to outer space(Horneck et al, Space
microbiology).
Microorganisms tested in outer Space: The survival of
some microorganisms exposed to outer space has been
studied using both stimulated facilities and low earth orbit
exposures. Bacteria were som of the first organisms
investigated , when in 1960s A Russian satellite carried
E.coli,Staphylococcus sp,Emterobacter sp imto
orbit(Love et al,2016). It is possible to classify the
microorganisms into two groups :
● The human borne
● Extremophiles
● The Human Borne: These microorganisms is
significant for human welfare and future crewed missions
in space(Space flight alter bacterial social network-
NASA-2013). NASA has pointed out that normal adults
have ten times as many microbial cells as human cells in
their bodies(Olsson et al). They are also nearly
everywhere in the environment. And although normally
invisible, can form slimly biofilms.
 Extremophiles: They have adopted to live in some of
the most extreme environments on earth. This includes
hypersaline lakes, arid regions, deep sea, acidic sites, cold
and dry polar regions, and permafrost(Rothschild et al).
The existence of extremophiles has led to the speculation
that microorganisms could survive the harsh conditions of
extra terrestrial environments and be used as model
organisms to understand the fate of biological systems in
this environments. Because of their ubiquity and
resistance to space craft, decontamination bacterial spores
are considered likely potential forward contaminants on
robotic missions to Mars. Measuring the resistance of
such organisms to space conditions can be applied to
develop adequate decontamination procedure(Nicholson
et al).
There are some microbes which are tested given
below:
 Actinomyces sp(Dublin et al)
 Aeromonus sp( Taylor et al)
 Anabaena sp(Olsson et al)
 Aspicilia sp(Raggio et al)
 Canine sp(Hotchin et al)
 Tolypthrix sp(de Vera et al)
 Symploca sp(de Vera et al)
 Deinococcus sp(Dose et al)
 Synechococcus sp(Mancinelli et al)
 Circinariasp (Sanched et al)
 Buelliasp (Meeben et al)
 T7 bacteriophage (Koike et al)
 Influenza PR8(Hotchin et al)
IV. CHANGES IN BACTERIAL INVASION
Many space-based experiments have proved that
the virulence of the bacteria would be changed.
Nickerson et al. found that Salmonella grown during
space-shuttle mission STS-115 in2006 underwent major
changes in the expression of 167 genes (Wilson JW et al).
When administered to mice back on Earth, the bacteria
proved more deadly than an equivalent strain grown on
the ground (Wilson JW et al,2007). They reported that
spaceflight-induced increases in Salmonella virulence are
regulated by media ion composition (Wilson et al,2008).
Space research projects on S. pneumoniae were carried
out in 2008 by the US NASA (Streptococcus pneumoniae
expression of genes in space) and found that the state of
low-shear modeled microgravity increased the capacity of
Streptococcus pneumoniae to adhere to and infect
respiratory epithelial cells; in a mouse-infection model,
the median lethal dose 50 of a microgravity-induced
strain significantly decreased when compared with the
wild-type strain(Allen CA). The genetic ana lysis
demonstrated that low-shear modeled microgravity can
cause some changes in the gene expression of S.
pneumoniae, but that it does not influence the genes that
encode the main virulence factors(Allen CA et al). Our
preliminary studies on K. pneumoniae that were
transported on the Shen Zhou VIII spacecraft
demonstrated that hemolytic mutations and biochemical
profiles of expression significantly changed in the
bacterium as a result of space environment exposure.
V. CHANGES IN ANTIBIOTIC
RESISTANCE
It has been observed that reversible increases in
antibiotic resistance occured during short term space
flight (Taylor et al). MICs of E. coli, which were obtained
from the commensal flora of an astronaut during the
Salyut 7 Mission, and were isolated against both colistin

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and kanamycin increased significantly (Tixador R et al).
In addition, the Challenger experiments established that
in-flight-cultivated E. coli ATCC 25992 grew more
rapidly in subinhibitory concentrations of colistin than
cells cultured in a terrestrial environment (Lapchine L et
al). In our study, we found that drug sensitivity of four
species of bacteria showed obvious changes. E. coli
isolate with resistance to ampicillin, cefazolin,
ceftazidime, ceftriaxone and azithromycin increased
significantly; K. pneumoniae isolates with resistance to
cefazolin, ceftazidime and ceftriaxone increased
significantly; E. faecium isolates with resistance to
azithromycin and meropenem increased significantly; and
B. cereus isolates with resistance to amikacin increased
significantly.
VI. THE BACTERIA CONTINUE TO
ALTER THEMSELVES TO ADAPT TO
ENVIRONMENTAL CHANGES
In outer space, the lag phase of the microbial
growth curve was observed to be shorter, whereas growth
and reproduction rates increased along with the potential
to increase the production of secondary metabolites
(Horneck G et al). Fang et al. found that the degree of b-
lactam antibiotic production by Streptomyces
clavuligerus was markedly inhibited by simulated
microgravity, which could be relevant to stimulatory
effects of phosphate and l-lysine(Fang A et al).
Phenotype microarrays are a high-throughput phenotypic
testing method that carry out gene function analysis.
Therefore, we used the phenotype microarrays to
demonstrate the bacterial changes in metabolism
(Bochner BR et al). Compared with the ground control
group, all space bacteria demonstrated significant
changes in glucose metabolism, amino acid metabolism
and production of several antibiotic-associated secondary
metabolites. As with K. pneumonia, there are many
metabolic differences in the mutant strain LCT-KP182 in
fusidic acid, d-serine, troleandomycin, minocycline,
lincomycin, guanidine HCl, niaproof 4, vancomycin,
tetrazolium violet and tetrazolium blue when compared
with the ground control LCT-KP214.
VII. ADVANTAGES ON MARS
Modern technology has already allowed us to
use microbes to assist us in extracting materials on Earth,
including over 25% of the our current copper supply.
Similarly, microbes could help serve a similar purpose on
other planets to mine resources, extract useful materials,
or create self-sustaining reactors. The most promising of
these candidates known to date is cyanobacteria. Billions
of years ago,cyanobacteria originally helped us create a
habitable Earth by pumping oxygen into the atmosphere,
and manage to exist in the darkest corners of the Earth.
Cyanobacteria, along with some other rock-eating
microbes, seem to be able to withstand the harsh
conditions of the vacuum of space without much effort.
On Mars, however, cyanobacteria will not even have to
endure such harsh conditions(Wilson JW et al). Scientists
are currently working on the possibility of installing
bioreactors or similar facilities on Mars, which would run
entirely on cyanobacteria and provide material for the
creation of fuel cells, soilcrust formation, regolith
amelioration, extraction of useful metals/elements,
nutrient release into the soil, and dust removal; a variety
of other potentially useful functions are also in the works.
VIII. ANTIBIOTICS PRODUCTION
FROM SPACE
Test tubes of bacteria produce more antibiotics
in space than they do on Earth. Experiments sponsored by
Bristol-Myers Squibb in the mid-1990's revealed that
microbes grown in test tubes or gas-permeable bags
aboard the space shuttle produced more antibiotics than
did microbes on the ground. In one case the improvement
was as much as 200%.Antibiotic production is an
important part of the pharmaceutical industry on Earth, so
this result caught the attention of scientists and business
people alike. Is it time to move antibiotic factories to
space? Not yet. Sophisticated bio-reactors on Earth still
yield more antibiotics than simple test tubes or bags do on
orbit. The value of space -- for the moment -- is as a
laboratory. Ongoing research is supported by BioServe
Space Technologies, a NASA Commercial Space Center
(CSC)at the University of Colorado, industry partner
Bristol-Myers Squibb, and NASA's Space Product
Development program. Their goal is simple: to find out
why microbes yield more antibiotics on orbit, and apply
those findings to increase yields on Earth. It's possible
that the increase occurs simply because of the way
microgravity alters the motions of fluids surrounding the
bacteria, says BioServe associate Director David Klaus,
who co-heads the study. On Earth, gravity causes the
fluid -- that is, the medium -- to circulate. Heavier fluids
fall and lighter ones rise. Within the medium, cells and
the molecules they produce mix and move around. "But
in a zero-g environment," points out Klaus, "there is no
convection, or buoyancy, or sedimentation." Less of the
mixing normally caused by such factors could change the
metabolic activities of these one-celled creatures. For
example, when bacteria are introduced into a new
environment, they don't start multiplying immediately.
First, they have to 'condition' themselves or their
surroundings. That is the reason that you can leave food
out for a while before it begins to spoil. Researchers
speculate that bacteria produce vitamins, enzymes or
other "cofactors" either inside or around the cell. Cells
will begin to multiply only when enough of those
substances have accumulated. In microgravity, the
bacteria seem able to achieve this conditioning and begin
growing sooner than they can on the ground -- perhaps
because of reduced mixing. If a cell excretes a certain

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type of molecule, those molecules stay closer, and their
concentration increases faster. The same kind of change,
Klaus suggests, might account for the increased
production of antibiotics.
IX. FOOD PRODUCTION BY
BACTERIA IN OUTER SPACE
Sunlight on Mars is less intense than on Earth.
So we can use cyanobacteria for food production. To use
cyanobacteria as a raw material and energy for the next
step of synthesis is a good idea. But thechallenge will lie
in finding a suitably fast production process.
Cynobacteria produce sugar from sunlight and CO2, and
Bacillus subtilis then use it to produce whatever we want.
The bacteria can alsobe genetically modified versions of
a special type of bacteria, the photo synthetic cyano
bacteria Synechococcus elongatus, and another common
bacteria, Bacillus subtilis. The two species work together
in a so-called co-culture, where one depends on the other.
These genetically modified bacteria can be used for
diseases resistant grain production.
X. PRODUCTION OF ALCOHOL BY
BACTERIA IN OUTER SPACE
Space research with microbe fermentation might
help improve this process. Yeast are tiny single celled
fungi important for brewing beer and baking bread.
Understanding the puzzling behaviour of such cells in
space will benefit pharmaceutical research here on earth.
We should try to do now is to find the specific
mechanism of that (increased fermentation efficiency in
space), and then we can ask whether we can modify the
fermentation process on earth to take advantage of that. A
more efficient fermentation process, even by a small
percentage save millions of dollars in production costs.
For beer, of course, increased fermentation efficiency
means a more alcoholic brew-not necessarily good news
for crew members who need to remain sober in the
dangerous environment of space. The space brews would
need to be adjusted and of course, consumed in
moderation.
XI. BENEFITS OF THE MICROBIAL
OBSERVATORY PROGRAM IN
OUTER SPACE
There are numerous benefits from enabling and
expanding microbial diversity research on the ISS. From
a microbial ecology perspective, research in this area has
the potential to play a major role in the development of
the microbial ecology of indoor environments. Humans in
the developed world spend more than 90 percent of their
lives indoors where they are exposed to airborne and
surface microorganisms. These microbial communities
might be intimately connected to human health. Examples
include the spread of acute respiratory disease (Cohen et
al. 2000, Smith 2000, WHO 2007, Glassroth 2008) and
the increase in the occurrence of asthma symptoms (Ross
et al. 2000, Eggleston 2009, Schwartz 2009). The relative
abundance of human-associated bacteria, including those
that could potentially cause disease, is higher indoors
than outdoors. As the ISS is relatively closed, the
microbial diversity is relatively stable throughout the
interior of the station, such that the dispersion of new
microorganisms can be tracked and impact of their
addition on the ―station‖ community can be evaluated.
This premise may also be possible for investigations into
changes in the astronaut microbiome. The use of the ISS
as a microbial observatory would drive experiments that
could decrease infectious disease risk during the human
exploration of space, advance the application of
beneficial purposes for microorganisms (e.g., waste
remediation, probiotics), and provide unique insight into
basic microbial functions and interactions that could be
translated to studies for scientists and commercial entities
on Earth. Translation of spaceflight findings has already
begun to take place as scientists and corporations are
investigating the use of ISS microbial findings to better
understand virulence profiles, antibiotic and disinfectant
resistance, biofilm formation, and biodegradation
properties.
As NASA travels beyond low-Earth orbit to
planets such as Mars, insight from an ISS Microbial
Observatory will impact our approach to exploration.
Understanding how spaceflight and gravity alter
microbial responses, their exchange of genetic material,
and their expected concentrations and distribution will be
vital in our search for extraterrestrial life and concurrent
planetary protection.
CONCLUSION
Although a variety of bacteria have
demonstrated changes following space flight, the
mechanism of this alteration still remains unclear. For
those with limited production capacity and expensive
drugs, we can use the spacecraft equipped with
microorganisms to improve their drug producing ability.
This will become an important issue for aerospace
technology used in the pharmaceutical industry. In
recent years, with the large-scale application of
antibiotics, levels of multidrug resistant and pan-resistant
bacteria have significantly increased, and antibiotics are
becoming less effective. Therefore, it is important to
explore new anti-infective strategies and techniques.
Space flight provides a new platform for the
development of space microbiology. The influence of
space environment on bacterial mutations may lead to
some new risks for humans. For example: pathogens
with increased virulence and antibiotic resistance in the
space environment may be a threat to the health of
astronauts; with the expansion of the scope of human
space exploration, mutated bacteria transported by

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humans may pollute the space environment; and after the
spacecraft has returned to Earth, mutants with high
virulence and resistance may also be a threat to human
health on the ground. Therefore, studying the effects of
the space environment on different pathogens and its
relevant mechanisms are very important and necessary
for protecting the health of astronauts and humans on
Earth. That research will use advanced molecular
biology, genomics, bioinformatics, and cultivation
technologies to understand spaceflight microbial
community fundamental properties, interactions with
humans, and adaptation to other planets or interplanetary
space. It is critical that we develop a better understanding
of the changes that may be induced in the various
types of microbial relationships with humans in the
unique space environment as humans prepare to spend
increasing periods of time in space. The study of the
effects of the space environment on microorganisms
and their mechanisms will continue to be a vital part of
manned space exploration, one that will benefit the
study of the origin of life and biological evolution.
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