Perceptions of HK stakeholders

Ultimately, stakeholders reflected on potential risks; at the same time, they balanced the perceived benefits and perceived harms of using the microbial biosensor. Most stakeholders’ perceptions follow a single path and the majority has no intention to use for the following reasons:

1. the biosensor is useless in their field,
2. the biosensor is unable to achieve sustainability in either aspects, including economics, social and environmental,
3. the biosensor is an inappropriate device in their field,
4. the biosensor is not suitable to be used in their workplace, and
5. the perceived risks of the microbial biosensor outweighed the original perceived benefits.

1. The Expected Achievements in Sustainability
   1. Achieving Eco-Environmental Sustainability
      - FOCUS ON MY NEEDS, NOT ON THE FEES

      Stakeholders were asked about how they perceived the use of microbial KPN biosensor as an effective means to utilise available resources efficiently and responsibly.
      Local organic farmers believed a microbial biosensing should be cheaper than contemporary soil testing methods, and the biosensor device should be tolerable and renewable so as to minimise the operation cost. They perceived a microbial KPN biosensor could constantly monitor the fluctuation of soil nutrient concentrations, such that humus can be composted to maintain soil quality; and hence, ensuring financial obligations over time are met.
      In maintaining the water quality of Gei Wai, a traditional Chinese tidal shrimp pond, Ms Nag-Yee LAI, WWF-HK reserve officer in Mai Po shared the same view towards the device that it should be economically viable. She believed this could reduce the expenses on water tests and the device would be an alternative to observe the fluctuation of nitrate and phosphate ion concentrations in Gei Wai such that researchers could monitor the relationship between the reduction of harvest and the changes in nitrate and phosphate ion concentrations.

   2. Socio-Environmental Sustainability
      - CRADLE-TO-CRADLE

      Ms LAI also perceived the KPN microbial biosensor could possibly be a tool in understanding the ecology of Gei Wai as the device would be useful for the surveillance of algal bloom, and understanding the Gei Wai ecosystem; thereby, conserving the Mai Po reservation zone.

   3. Achieving Socio-Economical Sustainability
      - ACCOUNTABILITY & RESPONSIBILITY ARE HARD

      Ms Christine CHIU, a biosafety specialist in the Health, Safety and Environmental Office in the Hong Kong University of Science and Technology, also a past regional iGEM jamboree judge perceived the microbial biosensor should be viable for the economically-disadvantaged. Impressively, Christine valued the work ethics of researchers and designers the most. She showed a holistic views towards biosafety of microbial biosensors and pointed out risk managements on gene level, molecular level, human community level and ecological level should not be ignored, and it was the researchers and designers accountability and responsibility to safeguard human health and the ecosystem.

2. Perceived Usefulness
   1. Effectiveness and Efficiency
      - ONE DEVICE, ONE UNRIVALLED SENSING

      Local organic farmers perceive microbial KPN biosensor, which can only detect specific compounds, as an insufficient measurement. They perceived an effective microbial KPN biosensor should give a complete profile of the nutrients. Furthermore, they believed a sensor could monitor nutrient concentrations change with time. Speed is not a concern for most of the local organic farmers. They understand it takes time for microbial fermentation of the compost. They perceived an instantaneous presentation brings no significance to monitoring fermentation and the change in soil quality over time.
      Prof Hon-Ming Lam, agro-biotechnologist, pointed out the practicality for an effective microbial biosensing. Here is the summary of his concerns: (i) in which bacterial growth phase is used for biosensing; (ii) the possibilities to produce quantitative results; (iii) whether the detection is truly linear; (iv) the ability of biosensing a wide range of concentrations of KPN in soil; (v) the advantages of KPN microbial biosensor over the contemporary physical tests.
      When further asked about the possibility of using microbial biosensor for measuring the soil ionomics, he perceived it would be an inefficient use since physical method e.g. X-ray fluorescence imaging is good enough. Similar view is shared by Mr CHAN, iVeggie hydroponic farm operator in HK, who doubted the efficiency of the microbial biosensor for the detection of the ion concentrations when compared to automated detection facilities in his hydroponic facilities.
      As for the N and K detection in marine environment, Dr Tin-Ki TAM, technician of the HKUST Coastal Marine Laboratory worried the detection environment, in which innumerable factors present would interfere the accuracy of biosensing. Furthermore, he perceived that the application of sensing techniques should be standardised, so that the procedures and results could be reproducible and internationally recognised.
      On the contrary, conservation officer valued the efficiency in generating data and data processing for analysing the nitrate and phosphate concentrations in the traditional tidal shrimp ponds due to the limited manpower.

3. Changes of Perceptions

   Stakeholders are informed about biosensing involved the use of GEM, which could possibly directly or indirectly contact with the medium. Most stakeholders had reservations or negative perceptions regarding the application of KPN microbial biosensor in their field.

   1. The Appropriateness of Settings
      - THE MICROBIAL BIOSENSOR TOPS CONCERNS

      Overall, the stakeholders were most concerned with the appropriateness of using GEM or the GEM-containing device in their field or whether it would be suitable to place the GEM-containing in their field. Some organic farmers questioned if GEM an appropriate device in organic farming, regardless of its design. They believed the application of in-field GMO-containing devices violated the principles of organic farming.
      As in natural reservation zone, conservation officer hesitated and pointed out the possibility that the GEM-containing device would be treated as inappropriate in reservation zone; in addition she mentioned parties, including the government and the public, that would exert pressure on these novel, and yet untested, devices for in-field research.

   2. The Perceived Risks
      - MICROBIAL BIOSENSOR: SABOTEUR OF THE STATUS QUO?

      Even if it could be an appropriate use, stakeholder questioned on the esoteric character of in-field GEM. They were aware of the risks of using GEM in their field and balancing the perceived risk against the perceived usefulness.
      All organic farmers were hesitated and/or resisted to adopt an in-field microbial biosensor. Some worried about whether GEM would be released in soil for direct measurement or by accident; and subsequently, their effects, including but not limited to bacterial gene transfer.
      Chemist in Hong Kong Drainage Service Department was suggested using KPN microbial biosensor for in-the-tank detection, he believed the quantity of microbes in the device would be in small quantity and could be handled by disinfection system for any leakage, but he questioned what happened if the leakage occurred after disinfection.

Future Research

The conclusions drawn from the results offer a well-founded point of departure for future studies. Possible topics include:

1. An investigation of what proportion of the general population perceives biosensors as a risky endeavour with respect to the agricultural goods they consume, especially food products.
2. Projected cost differences between field-tested soil sensing devices--the proposed microbial biosensor compared to a chemical-based test kit.
3. A study on differences in time between sample collection and useful results for both the proposed microbial biosensor as well as traditional chemical soil detection methods. How important is this time point to the stakeholders?
4. The implications of microbial biosensing technology on the existing agricultural workforce. Would the implementation of the proposed device reduce the need for additional manpower? In other words, how does the use of a microbial biosensor affect perceptions of job availability in the agricultural field?
5. The role of precision agriculture in current farming practices. Could a microbial biosensor be applied to improve these large scale measurements?

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