Aspects of the invention relate generally to integrated automatic systems that receive and optionally extract samples, prepare media and assemble culture devices in situ in a compact format, and inoculate the media/culture devices in situ, which may then be incubated and read to quantitatively determine the bioburden of the sample. In additional aspects, the systems also, or alternatively, provide qualitative sample assessment (e.g., pathogens, spoilage organisms, microbiome of the food, allergens, GMOs, toxins, ingredients, etc.) using, for example, genetic based or immunochemical based detection methods, etc.
In microbiological testing of microbial bio-burden of samples, a portion of a sample is typically extracted and plated on various microbiological medias by pour plating, spread plating or spiral plating methods, each of which may allow one or more groups of organisms to grow to form colonies. The colonies, after appropriate incubation, are then counted, and the bio-burden is calculated and reported based on cfu/gram, or cfu./ml., or cfu/unit of a product or square centimeter/sq inch.
The microbiological plates most commonly used are petri dishes, but alternatives to petri dishes have been introduced into the market. For example, miniaturized alternatives include microfilm, petri-film, peel-plate, etc. These devices are manufactured centrally, sent to irradiation, and then distributed worldwide to laboratories.
A few companies also have developed automated systems where the extracted samples are loaded on the machines, and the machines automatically plate on various medias as required by the laboratory information management system (LIMS). While such automated systems greatly reduce labor cost, each automated system is designed for specific size and type of pre-assembled microbiological plates, the stock of which is influenced by supply chain and product shelf-life. While some of these systems make Petri dishes during the automated process, the assembled Petri dishes are problematic in a sense that they are bulky and require the addition of agar-based media at elevated temperature, typically resulting in solidification inside the transfer tubes. These systems also require water baths to maintain the media at elevated temperatures.
There is a need for automated systems with sample extraction capability, that have in-situ preparation of media and assembling and inoculation of compact culture devices (e.g., thin microfilms, Petri-pouch, etc.), which are integrated for efficiently and selectively visualizing and quantifying cultured microorganisms, and which avoid problematic clogging issues without hot media requirements, or the need for water baths.
There is a further need for such automated systems that additionally, or alternatively, provide qualitative laboratory tests including but not limited to testing for pathogens, spoilage organisms, microbiome of the food, allergens, GMOs, toxins, ingredients, etc., by performing analyte extractions followed by detection.
Provided are integrated automatic systems that allow for an automated comprehensive quantitative and/or qualitative analysis of a samples. The automated system receives and extracts samples, produces media and assembles, in situ, culture devices in a compact format, and inoculates the media/culture devices, which may then be incubated and read to determine the bioburden of the sample, and/or qualitatively detect microorganisms in the sample.
The integrated and automated systems may provide in various portions or modules, for media mixing, dispensing, printing, sample extracting, diluting, dispensing and inoculation, in situ culture device assembly, incubation, image recognition and colony counting, and/or detection of target organisms, etc. Multiple versions of the in situ assembled culture devices may be used for quantification. In each case, the automated system will, for example, receive primary sample extracts in appropriate vessels with barcode issued by, e.g., a LIMS, the system will make appropriate sample dilutions, and an appropriate volume of each dilution is inoculated on the in situ assembled culture device(s).
Preferred versions of the integrated systems comprise integrated incubation and reader modules, and/or detection modules, that can automatically incubate the inoculated culture devices, and/or inoculated enrichment cultures, then read and/or detect, and report the data (e.g., to a LIMS system).
Embodiments of the disclosure can be described in view of the following clauses:
1. A system for microbiological assessment using in situ generated culture devices, comprising: an integrated automated system comprising sterile media and/or buffer reagents, culture device parts, and automated components for media and/or buffer handling, sample handling, culture device assembly, and microbiological enumeration, all within a sterile environment; and one or more processors; and memory, including computer-executable instructions that, if executed by the one or more processors, cause the integrated automated system to:
2. The system of clause 1, wherein execution of the computer-executable instructions further causes the system to:
3. The system of clause 2, wherein directing, in e) for incubation, comprises incubating the inoculated, attributed culture device in situ using an incubator integrated into the system, and/or incubating the inoculated, attributed culture device ex situ using a non-integrated incubator.
4. The system of clause 2 or 3, wherein enumerating, in f), the colonies in situ, comprises using an integrated imaging device and image analysis program.
5. The system of any one of clauses 1-4, wherein:
6. The system of any one of clauses 1-5, wherein the computer-executable instructions comprise one or more of LIMS instructions, PLC instructions, firmware, and programed instructions and logics.
7. The system of any one of clauses 1-6, wherein the specified type of in situ-assembled microbiological culture device comprises at least one selected from the group consisting of microfilm card, Petri-dish containing gel and or gum based media, and Petri-pouch.
8. The system of clause 7, wherein the in situ-assembled microbiological culture device is a Petri-dish, and wherein for the in situ assembly, execution of the computer-executable instructions further causes the system to:
9. The system of clause 8, wherein the introducing of the sterile mixture and the introducing of the coded test sample, or the extraction and/or the dilution thereof is simultaneous.
10. The system of clause 8 or 9, wherein the one or more congealable polymers and/or gums of the introduced sterilized mixture does not congeal at ambient temperature in the absence of one or more cations, and wherein, prior to introducing the sterile mixture and the sample, extraction or dilution thereof, execution of the computer-executable instructions further causes the system to:
11. The system of clause 10, wherein the one or more congealable polymers and/or gums of the introduced sterile mixture comprise pectin and/or alginate, and wherein the one or cations of the base gel layer comprises a divalent or trivalent cation.
12. The system of clauses 10 or 11, wherein the base gel layer comprises agar, gelatin, silica gel, or carrageenan.
13. The system of any one of clauses 10-12, wherein the one or cations comprises Ca2+.
14. The system of any one of clauses 8-12, wherein the sterile mixture is introduced in liquid form, or wherein the one or more congealable polymers and/or gums of the introduced sterile mixture is initially introduced as a coating in powder form, which upon the introduction of the media in liquid form and/or of the coded test sample, or the extraction and/or the dilution thereof, absorbs and forms a gel over the base gel layer.
15. The system of clause 7, wherein the in situ-assembled microbiological culture device is a microfilm device having a backing card and a top cover, and wherein for the in situ assembly, execution of the computer-executable instructions further causes the system to:
16. The system of clause 16, wherein the surface of the backing card defines a reservoir to receive the media and the coded test sample, or the extraction and/or the dilution thereof, the reservoir having a surface area defining the desired test area.
17. The system of clause 15 or 16, wherein, before or after applying sterile media to the surface of the backing card, execution of the computer-executable instructions further causes the system to:
18. The system of clause 17, wherein the adhesive comprises a pressure sensitive glue.
19. The system of any one of clauses 15-18, wherein prior to placing the top cover, execution of the computer-executable instructions further causes the system to:
introduce an amount of concentrated media to be diluted by the introduced coded test sample, or the extraction and/or the dilution thereof.
20. The system of any one of clauses 17-19, wherein the adhesive, gel, wax or grease is applied prior to the sterile media.
21. The system of any one of clauses 15-20, wherein the applying of the sterile media to the surface of the backing card comprises:
22. The system of any one of clauses 15-21, wherein the top cover is pre-coated, on a surface, with a gelling agent powder, with or without dry media or media components.
23. The system of clause 7, wherein the in situ-assembled microbiological culture device is a Petri pouch, having or configured to have an opening.
24. The system of clause 23, wherein for the in situ assembly, execution of the computer-executable instructions further causes the system to:
25. The system of clause 24, wherein the sterile mixture is introduced in liquid form, or wherein the one or more medias and the one or more congealable polymers and/or gums of the introduced sterile mixture are initially introduced in powder form, which upon the introduction of the coded test sample, or the extraction and/or the dilution thereof, absorbs and forms a gel.
26. The system of clauses 24 or 25, wherein the one or more congealable polymers and/or gums of the introduced sterilize mixture does not congeal at ambient temperature in the absence of one or more cations, and wherein the inside of the Petri pouches is pretreated with the one or more cations, which are diffusible into the introduced sterile mixture and the sample, extraction or dilution thereof.
27 The system of clause 26, wherein prior to introducing the sterile mixture and the sample, extraction or dilution thereof, execution of the computer-executable instructions further causes the system to:
28 The system of clause 27, wherein the one or cations comprises a divalent or trivalent cation.
29. The system of clause 28, wherein the one or cations comprises Ca2+.
Those of skill in the art will understand that the drawing(s), described below, are for illustrative purposes only. The drawings are not intended to limit the scope of the present teachings in any way.
Aspects of the invention overcome deficiencies of current methods for microbiological testing.
Provided is a process and integrated automated system for a quantitative and/or qualitative microbiological testing system with in-situ production of microbiological culture devices (e.g., Petri dishes, microfilms, Petri pouches) for microbiological culture. The integrated automated system receives primary samples having sample IDs, in appropriate containers, and/or extracted samples, having sample IDs, as a starting point. After reading the sample ID, the system communicates with e.g., the Laboratory Information Management System (LIMS), and receives testing instructions comprising dilution instructions, etc., and, in the case of quantitative assessment, instructions for plating of each dilution with one or more different media and with one or more different culture devices, based on the tests needed, and/or in the case of qualitative assessment instructions for inoculating enrichment cultures for target organism detection.
For extracting samples in automated fashion, each primary sample is extracted by introduction of an appropriate buffer or media, mixing, and if needed withdrawal of sub-samples for serial dilutions.
Microfilms (thin-films). A first exemplary culture device embodiment comprises is situ assembled microfilms. For quantitative assessment using such microfilms, for example, vessels containing extracted samples, or dilution vessels, are then moved into another position (plating position) of the automated system where an appropriate amount of each sample/dilution is plated on a respective micro-film culture device that is manufactured in situ in a separate module (thin-film assembly module) of the same automated system. For example, based on the LIMS instruction(s), a bottom card is picked up and placed in a microfilm assembly position. The card may consist of a piece of cardboard, or other suitable material, which has (e.g., is coated by, or otherwise comprises) a water impermeable barrier on at least one side.
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The assembled microfilms are labeled (coded in conformity with the sample), and directed/sent or moved into an integrated or non-integrated incubator at an appropriate temperature for each test.
Petri dishes. An alternate exemplary culture device embodiment comprises in situ assembled Petri dishes. For quantitative assessment using Petri dishes, for example, vessels containing extracted samples, or dilution vessels, are moved into a position (e.g., plating position) of the integrated automated system where an appropriate amount of each sample/dilution is plated on a respective Petri dish that is manufactured in situ in a separate module (Petri dish assembly module) of the same automated system.
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Petri pouches. An additional alternate exemplary culture device embodiment comprises is situ assembled Petri pouches. For quantitative assessment using Petri pouches, vessels containing extracted samples, or dilution vessels, are moved into a position (e.g., pouch plating position) of the integrated automated system where an appropriate amount of each sample/dilution is plated using a Petri pouch that is assembled in situ in a separate module (Petri pouch assembly module) of the same automated system.
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Incubators. With respect to any culture device embodiments, including those discussed above, processed in the integrated automated system, the incubators may or may not be integrated into the integrated automated system. Preferably using an integrated temperature-controlled incubation chamber, inoculated culture devices are placed and incubated at a temperature suitable to promote the growth of selective microorganisms (e.g., colonies of target organisms). The volume of the incubation chamber is preferably sufficient to incubate a production run of devices (e.g., accumulated production of devices accumulated in a 24 h production run). Alternatively, inoculated culture devices are transferred to an external chamber for ex situ incubation.
Reader modules. After appropriate incubation (e.g., determined by each of the LIMS test protocols), culture devices (e.g., microfilms, Petri dishes, Petri pouches, etc.) are retrieved from the incubators and are moved into the reader module (e.g., comprising an integrated imaging device and an image analysis program) where each culture device (e.g., micro film) is read and the data is transmitted into the e.g., LIMS system. After reading, culture devices are moved into storage devices (integrated or non-integrated) and stored until completion of QC and issuance of reports, after which they are disposed of in an appropriate manner. For example, the color and/or gas production of colonies to be enumerated are analyzed and reported into LIMS system. The incubated culture device may be positioned by a robotic arm, or other suitable appliance, on a first-in-first-out basis from the incubation chamber. In versions of the system where the inoculated device is incubated in an external (non-integrated) chamber, the positioning the culture device for image analysis is programmed accordingly.
Sterilization. Optimally, the system is fully enclosed and under positive HEPA filtered air pressure. All ingredients, media, buffers, microfilm cards, components, tubing, tips, etc., are pre-sterilized before being loaded into the automated system. The automated system may have an integrated clean in place (CIP) system for tubing components, UV lights may also be deployed to maintain a sterile environment (e.g., before starting the unit and during the sanitation cycle).
Stations/modules. The integrated automated system includes a plurality of functional modules or stations. The integrated automated system may, for example, include a media preparation portion/station, a sample extracting and diluting portion/station, a media and sample positioning and mixing portion/station, a culture device assembling portion/station, an integrated or non-integrated temperature-controlled incubation chamber, and an image analysis-based colony counting portion/station (e.g., digital) and/or a detection station for qualitative detection of target microbes, or of other analytes.
Quantitative tracks.
For quantitative application tracks, the automated system may, for example, using the functional modules or stations, quantitatively process a sample in the following exemplary steps: (1) a disinfected, dry powder mix of media is solubilized in water and added (optionally along with a gelling agent) to one or more specified version(s) of the in situ assembled microbiological culture devices: e.g., microfilm cards, petri pouch, or peri dishes; (2) a coded sample is extracted, diluted if specified, and added to the specified culture device(s) (e.g., Petri dishes, microfilms and/or Petri pouches, etc.) with attribution, and where the addition of sample or dilution thereof may optionally be simultaneous with media addition to facilitate mixing; (3) for microfilm card versions, a thin-film cover, optionally coated with a gelling agent, may be assembled on the upper surface of the base film (base or bottom card); (4) the assembled inoculated culture devices is/are incubated in a temperature-controlled chamber (incubator) for a specified period of time; (5) microbiological colonies forming on the culture device are analyzed; preferably by an integrated digital image-based, smart recognition and counting module/program, which reads and reports/stores the results, e.g., to LIMS components of the automated integrated system.
Example 1 (herein below) describes a quantitative track of the automated integrated systems, wherein microfilm cards serve as the culture devices, which are assembled in situ and inoculated in situ within a sterile environment for microbiological quantification.
Example 2 (herein below) describes a quantitative track of the automated integrated systems, wherein Petri pouches serve as the culture devices, which are assembled in situ and inoculated in situ within a sterile environment for microbiological quantification.
Example 3 (herein below) describes a quantitative track of the automated integrated systems, wherein Petri dishes serve as the culture devices, which are assembled in situ and inoculated in situ within a sterile environment for microbiological quantification.
Qualitative tracks. In microbiology labs some test samples (e.g., food or non-food sample, etc.) are not only subjected to quantitative determination of the number (enumeration) of various groups of microbes (e.g., yeast and molds, coliforms, fecal coliforms, generic E. coli, Enterobacteriaces, Lactic acid bacteria, Staphylococcus, B. cerus, etc.), but are also, or alternatively subjected to qualitative pathogen and/or spoilage organism detection(s) (qualitative microbiology). Additional qualitative tracks include, but are not limited to genetic testing for the presence of specific genes/genetic markers (e.g., authentication, GMO testing, allergen testing, species identification, ingredient identification, spoilage profile, etc.).
For qualitative application tracks involving detection of pathogens or spoilage organisms, for example, the automated systems may, using the functional modules or stations, qualitatively process a sample in the following exemplary steps: (1) concentrated media is added to a coded sample or extraction thereof to provide an enrichment culture with attribution (if multiple analyses are specified, and the medias are not compatible, the sample/extraction may be appropriately split to provide more than one attributed enrichment cultures); (2) the enrichment cultures are directed/sent to an incubator (preferably an integrated incubator) and incubated for a specified time to provide attributed enriched cultures; (3) the attributed enriched cultures are directed/moved to an detection module (preferably an integrated detection module); (4) an aliquot (typically small) of each coded enriched culture is taken and depending on the detection method, samples are transferred into respective, attributed reagent tubes/plates; and (5) detection assays (e.g., nucleic acid (e.g., DNA, RNA) or immunochemical based detection assays) are performed on the contents of the attributed reagent tubes, and the results reported/stored, e.g., to LIMS components of the automated integrated system.
For qualitative tracks involving genetic testing for the presence of specific genes/genetic markers, etc. (e.g., authentication, GMO testing, allergen testing, species identification, ingredient identification, spoilage profile, etc.), the automated systems may, using the functional modules or stations, qualitatively process a sample in the following exemplary steps: (1) a portion of the homogenized sample is diluted with an appropriate analyte extraction buffer; (2) the diluted samples are then directed/transferred to an appropriate extraction module of the system depending on the analyte (e.g., transferred to a bead beating module/components in the case of nucleic acid extraction; to a shaking heating module/components in the case of polypeptide/protein antigen extraction; etc.) for analyte extraction; (3) a portion of the extracted analyte is then directed/transferred to an appropriate detection module of the system (e.g., amplification (e.g., transferred to PCR/Isothermal) module/components in the case of nucleic acids; to ELISA and/or lateral flow module/components in the case of polypeptide/protein antigens; etc.), and the results reported/stored, e.g., to LIMS components of the automated integrated system.
Example 4 (herein below) describes automated integrated microbiological laboratory system embodiments having quantitative (e.g., pathogen or spoilage organism quantification) and/or qualitative tracks, for example, qualitative tracks such as genetic testing for the presence of specific genes/genetic markers (e.g., authentication, GMO testing, allergen testing, species identification, ingredient identification, spoilage profile, etc.).
The automated and integrated systems and processes addresses an unmet need by producing and assembling culture devices (e.g., Petri dishes, microfilms and Petri pouches, etc.) in situ on demand, commensurate with sample testing and quantification in an integrated onsite system, thereby bypassing the need of fabricating the devices at a non-integrated and/or distant site, sending them to irradiation, further sending them to the assay site, and storing them prior to use at the assay site, etc. Rather, sterilized components are assembled in a sterile integrated environment, eliminating the need to further sterilize, ship and store and/or open ex situ fabricated culture devices e prior to inoculation thereof. In combined qualitative/quantitative aspects, the integrated system provides for integrated incubation (for qualitative testing) and/or quantifying (e.g., colony counting) using the in situ assembled culture devices.
The following non-limiting working examples are provided to further illustrate particular embodiments of the invention disclosed herein.
Particular aspects of the present invention provide an integrated automated system comprising sterile media and/or buffer reagents, culture device parts, disposable and/or permanent dispensing tips, and automated components for media and/or buffer handling, test sample handling, culture device assembly, and microbial enumeration and/or detection, all within a sterile environment; and one or more processors; and memory, including computer-executable instructions (e.g., LIMS instructions, PLC instructions, firmware and programed instructions and logics) that, if executed by the one or more processors, cause the integrated automated system (e.g., upon loading of appropriate quantities of each sample, in an appropriate vessel, bearing appropriate coded instructions (bar codes, etc.)) to perform automated steps of the following method:
Microfilm cards. Particular exemplary microfilm card embodiments may comprise one or more layers of bottom backing card(s), an optional mid-restrictive layer, and a top cover optionally coated with a gelling agent thin-film. For example, in the automated integrated systems described herein, and using sterile ingredients, dry media is dissolved in water. A macromolecular-based thickener may be added to adjust the flow behavior of the media solution. The media solution is applied (may be printed) to a center reservoir of the backing card (based film), which may, as described above, have a layer of e.g., adhesive (e.g., pressure sensitive glue), gel, wax or grease deposited in a geometrical shape defining the outer borders of a test area that will contain the media. The extracted and diluted (where specified) coded sample suspension is dispensed into the center reservoir of base film. The media and sample may be introduced consecutively or simultaneously. A thin-film top cover may be pre-cut and stacked in the integrated automated system. The thin-film top cover may be pre-coated on one side (e.g., the bottom side) with an adhesive and/or a gelling agent powder with/without dry media or media components (e.g., that may consist of nutrients, buffers, chromogens, pH indicators, selective agents, growth factors, etc.). A robotic arm picks the coated thin-film cover and assembles it with the inoculated base film. The assembly is then stamped to distribute the sample over a test area between the base film and the thin-film cover, an attribution label is applied, and the assembled, inoculated coded thin-films are sent into an incubator, preferably an integrated incubator, set at an appropriate temperature and for a specified incubation time.
Particular aspects of the present invention provide an integrated automated system comprising sterile media and/or buffer reagents, culture device parts, disposable and/or permanent dispensing tips, and automated components for media and/or buffer handling, test sample handling, culture device assembly, and microbial enumeration and/or detection, all within a sterile environment; and one or more processors; and memory, including computer-executable instructions (e.g., LIMS instructions, PLC instructions, firmware and programed instructions and logics) that, if executed by the one or more processors, cause the integrated automated system (e.g., upon loading of appropriate quantities of each sample, in an appropriate vessel, bearing appropriate coded instructions (bar codes, etc.)) to perform automated steps of the following method:
Petri pouches. An alternate exemplary culture device embodiment comprises a plastic bag of appropriate size with or without closure mechanism(s). For example, in the automated integrated system as described herein, such culture bags are advanced to an assembly position. A positioned bag is opened, or is configured with a closable opening, in either case allowing for introduction of a powder, or liquid/paste media containing a suitable gelling agent, and introduction of a sample/dilution. After sample inoculation, the petri pouches are closed, gently mixed, labeled, and passed through a roller or two-plated, in any case with an appropriate gap to distribute the liquid and close the pouch (if not closed prior to mixing the sample and media within the pouch), they are then moved into an incubator, preferably an integrated incubator (e.g., in a first in, first out manner).
Particular aspects of the present invention provide an integrated automated system comprising sterile media and/or buffer reagents, culture device parts, disposable and/or permanent dispensing tips, and automated components for media and/or buffer handling, test sample handling, culture device assembly, and microbial enumeration and/or detection, all within a sterile environment; and one or more processors; and memory, including computer-executable instructions (e.g., LIMS instructions, PLC instructions, firmware and programed instructions and logics) that, if executed by the one or more processors, cause the integrated automated system (e.g., upon loading of appropriate quantities of each sample, in an appropriate vessel, bearing appropriate coded instructions (bar codes, etc.)) to perform automated steps of the following method:
Petri dishes. Additional alternate culture devices embodiment comprise Petri dishes. For example, in the automated integrated systems as described herein, Petri dishes are pre-loaded in the system. The dishes move into an assembly position, where lids are removed. A sterilized base media containing polymers that congeal in the presence of one or more of cations, gums, water, and appropriate salts containing the cations, etc., is added to cover the base to provide a thin formed gel coating on the base of the Petri dish (a base gel layer). The plate is then moved into another assembly position where an appropriate amount of the sample is simultaneously added, on top of the base gel layer, with an appropriate amount of a sterile mixture containing one or more medias plus one or more congealable polymers (e.g., pectin) and/or gums that does not congeal at ambient temperature in the absence of the one or more cations (e.g., Ca+2). The one or more cations are diffusible from the base gel layer into the introduced sterile mixture and the sample to provide for gel formation over the base gel layer. The lid is then placed on the plates, the plates labeled (coded with respect to the sample), and gently mixed and moved into an incubation stack which is then moved into an incubator (preferably an integrated incubator) at a specified temperature and for a specified time suitable to promote the growth of colonies corresponding to one or more target microorganisms.
Overview. In microbiology labs some test samples are subjected to qualitative microbiology (e.g., pathogen detection(s), etc.), as well as quantitative determination of number of various groups of microbes such as yeast and molds, coliforms, fecal coliforms, generic E. coli, Enterobacteriaces, Lactic acid bacteria, Staphylococcus, B. cerus, etc.
Particular aspects of the present invention provide an integrated automated system for quantitative and/or qualitative microbiology (or other qualitative analysis of samples), comprising sterile media and/or buffer reagents, culture device parts, disposable and/or permanent dispensing tips, and automated components for media and/or buffer handling, test sample handling, culture device assembly, and microbial enumeration and/or microbial detection and/or detection of other analytes, all within a sterile environment; and one or more processors; and memory, including computer-executable instructions (e.g., LIMS instructions, PLC instructions, firmware and programed instructions and logics) that, if executed by the one or more processors, cause the integrated automated system (e.g., upon loading of appropriate quantities of each sample, in an appropriate vessel, bearing appropriate coded instructions (bar codes, etc.)) to perform automated steps of the following exemplary method(s):
This application claims the benefit of U.S. Provisional Patent Application No. 63/439,561, filed Jan. 17, 2023, entitled “AUTOMATED MICROBIOLOGICAL LABORATORY FOR QUANTITATIVE MICROBIOLOGY USING IN SITU ASSEMBLED CULTURE DEVICES,” the disclosure of which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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63439561 | Jan 2023 | US |