95 results about "Biological studies" patented technology

The invention provides a construction method of a predictive cell senescence model, a method for predicting the senescence state of a tissue sample based on the senescence model, a method for screening potential therapeutic drugs, equipment, a medium and a program product, and relates to the field of intelligent medical treatment. The model construction method comprises the following steps: acquiring a training set sample expression profile data set; identifying a key senescence gene set from the data set by using a feature selection algorithm; inputting the key senescence gene set into a machine learning model to fit a prediction model, and determining an optimal hyper-parameter to obtain a cell senescence model containing the weight of a single gene in the key senescence gene set; the cell senescence model is a senescence score obtained by calculating the sum of the product of the expression quantity of a single gene and the regression coefficient thereof. The cell senescence model, namely PreCSenM, is constructed by integrating a plurality of senescence characteristic gene sets and a gene scoring algorithm, the accuracy in CS evaluation is superior to that of 10 existing methods, and the application of CS from biological research to clinical scenes is also realized.

The application discloses a construction method and application of an ovary cell line of Quasipaa spinosa. The method comprises the following steps: selecting metamorphosis period larva ovary tissue, disinfecting and obtaining the ovary tissue, and then using collagenase I digestion solution to digest the ovary tissue at 26 DEG C for 1 hour; after the tissue block adheres to the wall, using a low-osmotic-pressure complete culture medium to carry out primary culture at 25-27 DEG C, wherein the culture medium is 60% diluted DMEM / F12 culture medium containing 10%-15% fetal bovine serum; when the cell confluence degree is higher than 70%, using trypsin-EDTA to digest the cells for 1-2 minutes to subculture, and the subculture culture medium contains 30% cell conditional culture medium; and finally, the cells are cryopreserved through programmed cooling. The ovary epithelial cell line of Quasipaa spinosa is successfully established for the first time, the survival rate of the cells after recovery is high, and the karyotype is stable. The constructed cell line can be used for amphibian reproductive biology research, compound screening and in-vitro conservation of germplasm resources.

The invention relates to an osmanthus protoplast preparation method and an instantaneous conversion method. The preparation method of the sweet-scented osmanthus protoplast comprises the following steps: collecting different tissues of fresh sweet-scented osmanthus, performing surface disinfection and sterilization, cutting into thin strips or slices, adding enzymatic hydrolysate for enzymolysis, filtering, centrifuging, washing with a W5 solution, and re-suspending. The instantaneous transformation method of the osmanthus protoplast comprises the following steps: adjusting the concentration of the osmanthus protoplast by using an MMG solution, adding plasmids for mixing, adding a PEG solution for transformation incubation, adding a W5 solution for washing and centrifuging, and detecting the instantaneous transformation efficiency of the osmanthus protoplast. According to the method, a high-quality protoplast separation system of the leaves, the stems and the petals of the sweet-scented osmanthus is successfully established, efficient conversion of mesophyll and petal protoplast is realized for the first time, and a reliable technical platform is provided for molecular biology research of the sweet-scented osmanthus.

The application discloses a covalent polypeptide inhibitor targeting protein kinase A, a conjugate, a kit, a pharmaceutical composition and application. The general formula of the covalent polypeptide inhibitor is Z1-Seq-Z2; wherein Seq is an amino acid sequence; the C-terminal of Seq comprises a pseudo-substrate recognition motif recognized by protein kinase A, a non-natural amino acid with a covalent reaction group, and can be covalently crosslinked with a Cys200 residue on a catalytic subunit of protein kinase A; Z1 is selected from hydrogen, an acyl group, a fluorescent group, biotin, an isotopic tag or a biological ortho-reaction group; and Z2 is selected from a hydroxyl group, an amino group, a cell-penetrating peptide or a stabilization modification group. The covalent polypeptide inhibitor can strongly and irreversibly inhibit PKA activity, and can be used as an active probe to specifically label active PKA in a complex biological sample, and is used for biological research and drug development.

The invention discloses a method for extracting sphagnum moss protoplast, which comprises the following steps of: culturing a sphagnum moss material obtained by tissue culture under a certain condition, and performing pretreatment and enzymolysis under a specific permeation condition to finally obtain the high-quality sphagnum moss protoplast. The method provided by the invention provides an important technical basis for molecular biology research of sphagnum moss transgenosis and the like.

The invention relates to the technical field of biological research data analysis, and discloses a computational biological research data analysis display method, which comprises the following steps of: extracting total RNA (Ribonucleic Acid) from biological tissues or cells, reversely transcribing the RNA into cDNA (Complementary Deoxyribonucleic Acid), constructing a library, and sequencing the library by utilizing a high-throughput sequencing platform to obtain a large number of short sequences. According to the method, the number of the short sequences mapped to the same genome coordinate interval is compared and the threshold value is judged, so that the abnormal repeated area can be effectively identified, whether the gene expression difference result is credible or not is clearly judged, and when the number of the abnormal sequences exceeds the preset repeated sequence threshold value, the influence operation of the repeated sequences is eliminated, and the accuracy of the gene expression difference result is improved. That is to say, completely identical and overlapped short sequences are removed under the condition that the FPKM value is relatively high, and the updating result is compared again, so that the problem of expression quantity distortion caused by repeated reckoning can be corrected.

This invention provides a method for storing mango seeds, belonging to the field of seed preservation technology. The method involves cutting off mango fruits with embryos, along with their pedicels and branches, 77-84 days after fruit set. A mixture of pyraclostrobin, lambda-cyhalothrin, and chlorothalonil is sprayed on the fruit, pedicels, and branches. After drying, styrene-butadiene latex is applied to the pedicels and branches. Once the latex dries, a mixture of guanidine-copper acetate and benzoyl-pyraclostrobin is sprayed on the fruit, pedicels, and branches again. After drying, the mango fruits with petioles and branches are placed in a sealed box and stored at 10-14°C. The mango variety used is the Golden Phoenix mango. This invention increases the storage period of Golden Phoenix mango seeds from 1.5 months to 5 months, which is of great significance for the genomics and cell biology research of Golden Phoenix mangoes.

The invention belongs to the technical field of microbial genetic transformation, and particularly relates to a method for high-yield production of pleurotus ostreatus transformants, a genetic transformation system and application of the genetic transformation system. Through optimization of protoplast preparation conditions, the number of the obtained protoplast is 4.95 * 10 < 8 > CFU.mL <-1 >, and the regeneration rate of the protoplast in an OM-YEPS regeneration culture medium is 12.7%. A method for producing high-yield pleurotus ostreatus transformants is researched by using a PEG-mediated protoplast transformation method, a set of efficient and stable genetic transformation and screening method is established, about 200-300 positive transformants with stably expressed exogenous genes are obtained, and the transformation efficiency is 65.38%. The genetic transformation system of the high-yield Pleurotus ostreatus transformant, constructed by the invention, lays a solid technical foundation for subsequent gene function verification, metabolic engineering transformation and molecular breeding with excellent characters, and further accelerates the biological research and industrial application process of Pleurotus ostreatus and even other macro fungi.

The invention discloses an in-situ sampling method for root exudates of sesbania cannabina cultured by a solid substrate, and belongs to a technology in the related field of plant metabonomics. The method comprises the following steps: culturing sesbania in a solid matrix, obtaining a complete sesbania root system attached with rhizosphere soil, extracting root exudates by shaking, centrifuging to take supernatant, freeze-drying and the like. The method is simple to operate and short in time consumption, not only combines the advantages of traditional in-situ sampling to obtain the most real root exudates of sesbania in real time, but also can simulate the influence of saline-alkali stress and the like under natural conditions, is wide in application scene, effectively reduces the acquisition difficulty of the root exudates under the interaction of different soil conditions and plants, and has a wide application prospect. Important technical support is provided for biological research of sesbania, and the method has a relatively great scientific research application prospect.

The application discloses a monoclonal antibody of a rice field eel Adam8a and a preparation method and application thereof, relates to the technical field of biological antibodies, and fills the research blank of the rice field eel Adam8a. The rice field eel Adam8a monoclonal antibody is high in specificity and titer, simple in preparation process, and controllable in cost, can be widely used for recognizing Adam8a homologous proteins in different fish ovary, and is suitable for being prepared into a fish ovary Adam8a protein detection kit, and is compared with the expression of the protein in different fish, so that the rice field eel Adam8a monoclonal antibody becomes a very convenient detection tool in the biological research of fish ovary development.

The invention relates to ribozyme for labeling biotin on target RNA (Ribonucleic Acid) as well as a screening method and application thereof. The RNA labeling technology is one of core tools for modern molecular biology research and clinical diagnosis. A specific marker is covalently linked to a target RNA molecule, so that accurate tracking, efficient detection and functional analysis of RNA can be realized. A biotin-streptavidin system becomes one of the technical routes which are most widely applied due to extremely high affinity and signal amplification capability of the biotin-streptavidin system. At present, common biotin-labeled RNA technical methods mainly comprise a chemical solid-phase synthesis method, an enzymatic method and a chemical labeling method. However, the methods have the limitations of poor site specificity, low efficiency, complex manipulation and the like in the use process. The engineering ribozyme for catalyzing RNA biotinylation is obtained by taking 12: 0 biotin coenzyme A as a biotin donor through an in-vitro screening technology. The ribozyme provided by the invention can efficiently and specifically carry out biotin labeling on target RNA, the reaction process is simple, and the labeling activity is up to 90% or above.

The application provides a key enzyme involved in glycosylation modification of triterpene saponins, and an application thereof, and belongs to the technical field of genetic engineering. The glycosyltransferase gene is screened based on the omics research of the base plant of traditional Chinese medicine Duanxueliu, i.e. clinopodium gracile, and a pET28a-MBP-CcGT-g51295 prokaryotic expression vector is constructed to successfully obtain the glycosyltransferase. It is found that the glycosyltransferase can catalyze Saikogenin A and Saikogenin F to generate Prosaikogenin A and Prosaikogenin F respectively by using a glycosyl donor UDP-fucose; can catalyze Saikogenin A to generate clinopodiside I and clinopodiside X by using UDP-glucose; can catalyze Prosaikogenin A to generate Saikosaponin B1, Saikosaponin c1 and Saikosaponin X by using UDP-glucose; and can catalyze Prosaikogenin F to generate Saikosaponin A and Buddlejasaponin IV by using UDP-glucose, which reveals the catalytic function of the glycosyltransferase and provides a gene component for the biological research of triterpene saponins, and solves the problem of biological resources of rare saponins.

The present invention belongs to the technical field of genetic engineering, and specifically relates to a copepod luciferase mutant and the use thereof. The mutant is obtained by means of performing one or more mutations on a wild-type copepod luciferase with the signal peptide removed, and can be expressed in a prokaryotic expression system, resulting in an increased luminescence half-life or a signal rise within a certain time range, and the luminescence pattern of the luciferase is converted to glow-type luminescence or luminescence with a sustained increase in luminescence intensity. Some copepod luciferase mutants exhibit enhanced luminescence intensity. The mutant is widely used in biological research for real-time tracking and continuous monitoring, such as for labeling and tracking activities or processes in living organisms. On the basis of the advantage of increased luminescence half-life of the copepod luciferase mutant, the mutant can be used as and / or in the preparation of a glow-type luciferase. The copepod luciferase mutant is more suitable as a reporter gene for in-vivo detection in scientific research, and is conjugated with avidin, a digoxin antibody, etc., for sequencing, thereby shortening the sequencing time and improving the sequencing quality.

The utility model relates to the technical field of plant living body imaging, and discloses a plant living body imaging and simulation illumination device which comprises a box body, when the device is used, an LED plant growth lamp can be turned on firstly through an arranged environment simulation assembly, and light irradiates a plant through a through hole; light is dispersed around plants through the astigmatic lenses arranged on the through holes, so that more real natural light is simulated, meanwhile, natural light such as sunny days, cloudy days and night with moonlight can be simulated through the colored lenses, and an environment closer to the natural environment is created. According to the present invention, with the arrangement of the CCD camera, the weak fluorescence signal can be captured, the specific gene of the living plant can be subjected to fluorescence labeling, and after the EMS mutagenesis treatment, the fluorescence brightness change can be detected in the imaging device so as to find the enhancer or the suppressor, such that the biological research data can be obtained; and a better use prospect can be brought.

The present invention discloses a novel uniform strain chamber for an adherent cell loading device, which relates to the field of cell mechanics. Cells are planted in the novel uniform strain chamber of the adherent cell loading device, and the four positioning holes of the chamber are placed on a fixed pile. The fixed pile is connected to the stator. The controller controls the stepper motor, and the rotational motion of the motor is converted into linear motion through a transmission screw and transmitted to the mover, thereby indirectly strain stimulating the cells in the chamber cavity, thereby realizing relevant mechanical biology research on the cells. The strain of the adherent cell chamber in the existing cell tensile loading device is uneven, and the experimental results have large errors. In the invention, the elastic basement membrane of the chamber is designed to have one side as a plane, i.e., the part where the planted cells are poured into the cell culture medium, and the other side as a curved surface, i.e., an optimized surface. The longitudinal cross-section is an M-shaped structure, and its thickness variation meets the uniformity requirement of the strain of the plane part of the basement membrane during the chamber loading process, thereby increasing the uniform area of ​​the adherent cells in the strain loading, and therefore has high use value.

The application discloses a composite amplification detection system for body fluid tracing based on mRNA markers and application thereof, high-specificity mRNA markers can realize accurate tracing of five main body fluid types including peripheral blood, saliva, semen, menstrual blood and vaginal secretion, and can make up for the problem that in the previous body fluid tracing system, less markers lead to false positive or false negative problems caused by cross-reaction, and effectively improve the accuracy of single source and mixed body fluid, and old body fluid identification, and improve the applicability and feasibility of the system in forensic practice and biological research. Based on the fluorescence labeling technology, the application realizes stable, specific and efficient composite amplification reaction of multiple high-specificity mRNA markers at the same time, and the number of composite mRNA markers in the system is relatively large, and the identification efficiency of single source and mixed body fluid, and old body fluid is high.

The invention discloses a Phi29 DNA polymerase mutant with improved thermal stability, a construction method of the Phi29 DNA polymerase mutant and a genetically engineered bacterium. The mutant is obtained by performing single-point mutation on serine at the 527th site on an amino acid sequence shown as SEQ ID NO.2. The invention further discloses a construction method of the Phi29 DNA polymerase mutant. The mutant is realized through a single-point mutation design, and compared with a wild type Phi29 DNA polymerase, the mutant shows better thermal stability in a temperature interval of 40-70 DEG C. The Phi29 DNA polymerase mutant obtained by means of the construction method provided by the invention has better thermal stability. When being used for DNA amplification operation at a relatively high temperature, the fluorescent probe can present relatively high thermal stability, so that the fluorescent probe has relatively high application value and development potential in multiple fields of molecular biology research, clinical diagnosis and the like.

The application discloses a trienomycin photoaffinity probe, a preparation method and application, and comprises the following steps: taking Trienomycinol as a substrate, carrying out a substitution reaction with an iodine-substituted bisaziridine, then removing propylidene protection to obtain a corresponding photoaffinity negative probe; using Fmoc-D-alanine to selectively esterify a hydroxyl group at position 11 of the negative probe, then removing an Fmoc protection group on nitrogen and carrying out condensation with cyclohexanecarboxylic acid to obtain a corresponding photoaffinity positive probe; trienomycin protein target identification comprises the following steps: (1) enrichment of an intermediate Trienomycinol and synthesis of a trienomycin photoaffinity positive probe; (2) target identification of trienomycin by using the photoaffinity probe and molecular biology research on the target. The separated trienomycin intermediate, the synthesized trienomycin probe derivative and the identified trienomycin protein target have the advantages of high originality and high yield.

The invention belongs to the technical field of agriculture, and provides an artificial feed and a method for testing the influence of the artificial feed on the growth and development of tomato leaf miners, the method comprises three artificial feed formulas, and standardized feed blocks are prepared through moist heat sterilization and low-temperature preservation. The method comprises the following steps: subpackaging feed by adopting finger-shaped tubes, inoculating according to the density of 3 larvae in each tube, feeding at 25 + / -1 DEG C, and measuring indexes such as the duration, the survival rate, the pupation rate and the eclosion rate of the larvae. Results show that the difference between the formula I and natural foodstuff is minimum, the larva survival rate, pupation rate, pupa weight, eclosion rate and hatching rate are not obviously different from those of natural tomato leaf feeding, and although the larva and pupa duration is prolonged and the single female egg laying amount is reduced, the complete life history of tomato leaf miners can still be supported. According to the method, indoor stable test insects with consistent physiological status are realized, and reliable insect source guarantee is provided for biological research and prevention and control technology development of the tomato leaf miner.

The present application relates to the technical field of biological research data analysis, and discloses a kind of computing biology research data analysis display method, including extracting total RNA from biological tissue or cell, RNA reverse transcription is cDNA, constructs library, and utilizes high-throughput sequencing platform to sequence library, to obtain a large number of short sequences.The present application can effectively identify abnormal repeat regions by comparing and threshold judging the number of short sequences mapped to the same genomic coordinate interval, so as to determine whether the gene expression difference result is reliable, when the number of abnormal sequences exceeds the preset repeat sequence threshold, by eliminating the influence of repeat sequence operation, i.e. for the case of high FPKM value, remove the completely same and overlapping short sequences, and re-align the updated results, the expression distortion problem caused by repeat counting can be corrected.

The invention relates to a horizontal gel electrophoretic separation-online imaging device. The device comprises a device body, and a bottom plate assembly, a horizontal electrophoresis constant temperature module and a photographing module are arranged in the device body. The horizontal electrophoresis constant-temperature module comprises a tray assembly, a horizontal electrophoresis constant-temperature assembly, an electrode assembly and a driving assembly. The driving assembly is used for driving the tray assembly to enter and exit from the device body, the horizontal electrophoresis constant-temperature assembly is used for loading horizontal electrophoresis gel, and the electrode assembly is rotationally connected with the horizontal electrophoresis constant-temperature assembly. The photographing module comprises a frame assembly, a camera assembly and a light source assembly. The camera assembly is used for collecting a horizontal electrophoresis gel image, and the light source assembly is arranged on a light path between the camera assembly and the horizontal electrophoresis constant temperature module and is used for providing an excitation light source for horizontal electrophoresis gel. Compared with the prior art, the method is suitable for scenes of clinical diagnosis, molecular biology research and the like, and has the advantages of low cost, simplicity and convenience in operation, high detection quality and high stability.

The invention discloses a method for constructing a genetic transformation system of cymbidium kanran, which belongs to the technical field of plant genetic engineering, and comprises the following steps of: carrying out monoclonal propagation on rhizomes after germination of cymbidium kanran seeds to obtain vegetative propagules with stable characters, taking the vegetative propagules as transformation receptors, taking GFP (Green Fluorescent Protein) as marker genes, and constructing the genetic transformation system of cymbidium kanran. The method comprises the following steps: adding agrobacterium EHA105 into a YEB liquid culture medium containing 50 mg / L of kanamycin and 25 mg / L of rifampicin as a dip dyeing solution; placing the injured transformation receptor in dip dyeing for transformation, and then carrying out regeneration culture. The invention relates to a method for carrying out genetic transformation on cymbidium kanran by utilizing the innovative receptor and the screening culture medium, and the method can realize efficient and stable genetic transformation without genotype dependence and can solve the problem that the genetic transformation of cymbidium kanran varieties is difficult to carry out. According to the invention, an efficient genetic transformation and regeneration system of cymbidium kanran is established for the first time, and a foundation is laid for verification of related functional genes of cymbidium kanran and further development of biological research of cymbidium transgenic breeding and the like.

The application discloses a luciferase mutant, wherein the amino acid sequence is shown as SEQ ID NO. 1, and the polynucleotide sequence is shown as SEQ ID NO. 2. The catalytic activity of the luciferase mutant is 3 times higher than that of wild type, the luciferase mutant can be prepared through industrialization, and the luciferase mutant can be used for preparing a luciferase detection kit and used as a'reporter protein' or'reporter gene' for biological research.

The present invention belongs to the field of chemistry and biomedical technology, and in particular to a preparation of an organic molecule for light-controlled release of nitric oxide and its application in inhibiting tumor epithelial-mesenchymal transition (EMT). The present invention has developed and designed an organic molecule for light-controlled release of nitric oxide, which contains a benzimidazole group and a light-triggered nitric oxide releasing group. The molecule has aggregation-induced luminescence characteristics, which can realize wash-free cell imaging, and can exert the tumor-suppressing effect of benzimidazole in the absence of light. After releasing nitric oxide under light triggering, the tumor EMT process can be further regulated, and the two can synergistically induce cancer cell death. The organic molecule for light-controlled release of nitric oxide provided by the present invention is developed and applied to biological research for the first time, and provides a new idea for developing new nitric oxide donors and cancer treatment strategies.

The invention discloses a blocking agent for eliminating environmental DNA (Deoxyribose Nucleic Acid) of human pollution and a detection method of the environmental DNA, and the blocking agent plays a role in inhibiting amplification of a human source sequence by specifically hybridizing with a human source template and blocking primer annealing or DNA polymerase extension. The invention further provides application of the CRISPR-Cas12a technology to in-vitro removal of human-derived DNA pollution, the method can reduce the sequencing cost and the time cost of bioinformatics processing without affecting detection of target biological groups, and the method is mainly used for treating human pollution in marine environment DNA. And the method can also be used for treating human-derived DNA pollution in similar molecular biology research and application.

This invention discloses a method for establishing a horizontal gene transfer system between wolfberry and tomato and obtaining transformed roots. Using tomato and wolfberry (both belonging to the Solanaceae family) as starting materials, the method reduces the lignin content of wolfberry cells, eliminates the isolation layer between distantly grafted cells, and connects the grafted cells of the two species. Adventitious roots are induced at the grafting site of the tomato scion by treating it with different auxins. Morphological and molecular biological studies demonstrate that horizontal gene transfer occurred between wolfberry and tomato cells mediated by grafting, and the induced adventitious roots are transformed roots from wolfberry to tomato. This invention establishes a technical system for efficient transfer of wolfberry genes to tomato and obtains transformed roots, achieving complementary advantages between herbaceous and woody plant genetic resources. Tomato plants with transformed root systems exhibit good root vigor, strong plant growth, and a long growth cycle. Obtaining transformed roots is of great significance for improving tomato yield, quality, and resistance.

The application relates to a smell molecule and olfactory receptor reaction prediction method and device based on a multi-modal deep learning network. The method first uses the interaction data between smell molecules and olfactory receptors, extracts the physical and chemical descriptors of the smell molecules as the characteristics of the smell molecules, uses a deep learning network model to determine whether unknown smell molecules can stimulate olfactory receptors. Secondly, sequence data of the smell molecules are used to determine the possibility of the reaction between the smell molecules and each olfactory receptor through a network calculation model. Then, smell molecule structure image data are further introduced to calculate the reaction probability between the smell molecules and each olfactory receptor. Finally, in order to improve the accuracy and reliability of the recognition result, the obtained calculation results, i.e. two probability distributions, are analyzed to determine the final reaction olfactory receptor of the smell molecule. The application significantly improves the accuracy of the recognition of the smell molecules and the olfactory receptors, reduces the dependence on experimental methods, and provides a new tool for chemical and biological research.

The invention discloses a biological sample whole RNA normal-temperature long-term preservative as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The preservative comprises the following components: a tissue fixing agent, a tissue penetrating agent, a reactive biological sample encapsulating agent, a silicification blocking agent, a pH regulator, an ion concentration regulator and water. The preservative can be applied to bacteria, such as escherichia coli and staphylococcus aureus; a cell, such as an HEK293 cell, an ID8 cell; tissues such as mouse liver tissues and human tumor tissues; organs such as kidneys and hearts of small animals; the whole RNA of a complete organism, such as earthworms, fruit flies and other biological samples with different sizes can be stored at normal temperature for a long time, so that the RNA extraction efficiency and quality can be ensured, the method is particularly suitable for normal-temperature transfer and long-term storage of field collected samples and clinical submitted samples, and the RNA extraction efficiency and quality in subsequent molecular experiments can be ensured; the method is of great significance to molecular biology research and clinical diagnosis.

Provided is a kit for rapid detection of avian leukosis virus subgroup J (ALV-J) based on a CRISPR / Cas13a system. The method is based on the combination of the CRISPR / Cas13a system and recombinase aided amplification (RAA) for ALV-J detection. An oligonucleotide probe is designed as a substrate for CRISPR / Cas13a trans-cleavage and produces a detectable signal. The method can substantially improve detection sensitivity by amplifying a detection signal twice by RAA and T7 transcription. The detection method further exhibits excellent specificity, allowing for clear differentiate from other avian viruses. It does not require expensive experimental equipment and special laboratory environment, and it is rapid and efficient. The method is of great significance for biological research and on-site detection of ALV-J.

Methods, articles, and fluidic systems for sorting and growing organoids are generally provided. Organoids may be useful for various applications, such as certain types of biological studies, or for testing the biocompatibility and performance of drugs. However, conventional methods often struggle to identify, isolate, and use organoids. In some embodiments, using the droplet-based methods and associated articles and fluidic systems provided herein, organoids may be selected, isolated, and studied.