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Syto9 dye

Manufactured by Thermo Fisher Scientific
Sourced in United States

SYTO9 dye is a nucleic acid stain used in fluorescence microscopy and flow cytometry applications. It is a cell-permeant green fluorescent dye that binds to both DNA and RNA, allowing the visualization and quantification of nucleic acids within cells or cell populations.

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28 protocols using syto9 dye

1

Fluorescent E. coli Staining Protocol

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We grew Escherichia coli culture (JM109 strain, a gift from Prof. Fishman, Technion) in Luria-Bertani (LB) broth at 37 °C with vigorous shaking, to an optical density of 0.3 at 600 nm (OD600), corresponding to approximately 1.8 × 108 cfu/mL as measured by standard plating. We then concentrated the bacterial suspension by centrifugation at 14,000 × g for 2 min. Removing the supernatant, we resuspended the pellet in 0.85% NaCl and washed by an additional centrifugation step to remove significant traces of media. Next, we removed the supernatant and again resuspended the pellet in 0.85% NaCl, adding SYTO9 dye (L-7002, Molecular Probes, Eugene, OR) to a final concentration of 10 μM. The suspension was mixed and incubated at room temperature in the dark for 10 minutes. To discard remaining free fluorophores, we centrifuged the suspension, removed the supernatant and resuspended the pellet in TE to achieve the desired concentration. The composition of the LE was the same as in the focusing experiments, except for the concentration of bistris, which was 110 mM.
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2

PVDF Membrane Bacterial DNA Extraction

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Flat-sheet Durapore polyvinyl difluoride (PVDF) membrane (GVWP04700, 0.22 µm, 47 mm) was purchased from Merck Millipore (USA). Sodium alginate was purchased from Sigma (USA). Luria-Bertani (LB), agar, yeast extract and tryptone were purchased from HKM (China). Glutaraldehyde and anhydrous ethanol were purchased from Xilong Science (China). SYTO9 dye was purchased from Molecular Probes (USA). The PowerSoil® DNA Isolation Kit was purchased from MOBIO (MoBio, Carlsbad, CA, USA). Agarose was purchased from Biowest (Spain). The 2x Premix Taq DNA polymerase (Cat. #R004A) was purchased from TAKARA (Takara Bio, Terra Bella Ave. Mountain View, CA, USA). Universal primers 27F (5’-AGAGTTTGATCCTGGCTCAG-3’) and 1492R (5’-GGCTACCTTGTTACGACTT-3’) were synthesized by the Beijing Genomics Institute (BGI, Shenzhen).
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3

FA-SAT Copy Number Quantification

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For FA-SAT copy number absolute quantification (primers in Supplementary Table 1) the standard curve method was used as described in Chaves et al. (2017) (link). The MeltDoctor HRM Master Mix, which uses the SYTO9 dye (Applied Biosystems, Thermo Fisher Scientific) was used for the reactions following the manufacturer’s recommendations. StepOne real-time PCR system (Applied Biosystems, Thermo Fisher Scientific) was the equipment used and the program was: initial denaturation at 95°C (10 min), and then to 40 cycles at 95°C for 15 s followed by 59°C for 45 s and 72°C for 1 min. Subsequently, a melt curve was performed to evaluate the primers’ specificity. All reactions were performed in triplicate and negative controls (without DNA) were also included in the plate. StepOne software (version 2.2.2, Applied Biosystems, Thermo Fisher Scientific) allowed to create the standard curve (Supplementary Table 2) and to perform data analysis. The absolute quantification was transformed in fold-changes using the standard curve equation and always in comparison with a control sample. A cut-off ≥ 2 times was considered as biologically significant.
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4

High-Resolution Melting Assay for Genomic DNA Analysis

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Genomic DNA and DNA from FA-SAT clones, both of high purity, were analysed by High-Resolution Melting Assays (HRM) with MeltDoctor HRM Master Mix, which uses the SYTO9 dye (Applied Biosystems, Thermo Fisher Scientific), and with the 83-bp B and 83-bp C primers (supplementary table S1, Supplementary Material online). All the PCR mixtures were done according to the recommendations of the manufacturer. Experiments were performed in the StepOne real-time PCR system (Applied Biosystems, Thermo Fisher Scientific) with the next program: initial denaturation at 95 °C (10 min), 40 cycles of 95 °C for 15 s, followed by 59 °C for 1 min. Subsequently, a melt curve was performed with a denaturation step of 95 °C for 15 s, an annealing of 59 °C for 1 min and a high-resolution melting of 95 °C for 15 s with a continuous ramp rate of 0.3%, followed by a final step of annealing of 60 °C for 15 s. All reactions were performed in triplicate, and negative controls (without template) were also included on the plate. The StepOne software (version 2.2.2, Applied Biosystems, Thermo Fisher Scientific) was used for data acquisition and the High Resolution Melt software (version 3.0.1, Applied Biosystems, Thermo Fisher Scientific) for data analysis (we used the standard software parameters suggested by the manufacturer).
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5

High-Resolution Melt qPCR Species Identification

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All HRM-qPCR assays were carried out in a RotorGene Q machine (Qiagen, Hilden, Germany) in a 10 μl reaction volume consisting of 1 μl of a specific concentration of DNA template, 0.2 μM of each primer, 5 μl MeltDoctor™ HRM master mix containing SYTO 9 dye (Applied Biosystems, California, USA) and 3.6 μl sterile, deionized water. The thermal profile for each qPCR consisted of a pre-PCR step of 95 °C for 10 min, followed by 40 cycles of denaturing at 95 °C for 15 s and 30 s at the annealing temperature of 60 °C. Immediately following qPCR, HRM was carried out to identify the species using the melt curve analysis program. The HRM conditions were as follows: an increase in temperature from 60 ° C to 95 °C by 0.2 °C increments with a 2-s hold after each step. The average melting temperature (Tm) for each parasite species was determined using the High-Resolution Melt Software v 3.01 (Applied Biosystems, California, USA).
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6

Biofilm Volume Estimation via Microscopy

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Biofilms prepared on glass substrates were examined using Nikon A1R confocal microscope and the volume was estimated using BiofilmQ software, as previously described [23 (link),29 (link)]. Briefly, biofilms were stained with Syto9 dye (Invitrogen) in dark for 15 min and imaged every 1.74 μm along the biofilm height using a DIC 20× objective. Series of images were recorded on a minimum of three replicate samples. The total volume of biofilms in the assay was then calculated by extrapolating the value obtained for the image to the total surface area of one side of the glass slide. Thus, the data presented assumes that glass slides were fully covered with biofilms and that the obtained images are representative enough to allow extrapolation to the total surface area of the glass substrates.
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7

Visualization of Bacterial Biofilm Formation

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Plant seedlings grown for 7 days were directly root-inoculated with 10-μl SPMX suspension either coculture or monocultures (OD600 = 0.2) applied by pipetting and cultivated under the same conditions in the greenhouse as described above. Plant seedlings without bacterial inoculation were used as control. The root samples were harvested after five days and visualized by fluorescent staining and CLSM. The roots, containing SPMX co-cultures and monocultures, were firstly fixed in 4% (w/v) paraformaldehyde at room temperature for 15 min, and then stained with SYTO9 dye (Invitrogen) at a dilution of 1:1000 in PBS and 0.1% (g/L) calcofluor white (CFW, Sigma-Aldrich). Biofilm formation on roots was imaged by CLSM (LSM 800, Zeiss) with a Plan-Apochromat 63x/1.4 oil DIC M27. Z-stacks were recorded using Axiocam 503 mono to obtain three-dimensional (3D) images. The maximum excitation and emission wavelengths for SYTO9 and CFW were 485 and 498, 405 and 433 nm, respectively. The middle section (~5 mm) of the roots was mainly investigated. Representative images are shown in results.
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8

Diatom and Bacteria Enumeration Protocol

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For N. palea counts, unstained algae were gated based on their forward scatter parameters (FSC-A) and chlorophyll fluorescence (690/50 nm). Bacteria were accounted using SYTO9 dye (Invitrogen). Samples were incubated with 5 μM of the probe for 15 min in the dark at room temperature. Bacteria were detected and enumerated based on the fluorescence emitted by SYTO9-positive events (525/40 nm) and side scatter parameters (SSC-H). Normalized growth rates of the diatoms and bacteria were calculated as follows:
Cs corresponds to the organism concentration at sampling time, Mic is the mean initial concentration of organisms (at T−48h for diatoms and at T−24h for bacteria) and MCtGr is the mean growth rate in the control group at sampling time.
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9

Quantitative RT-PCR Protocol for Gene Expression

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qPCR experiments were performed in Corbett RotorGene 6000 Real-Time PCR instrument (Corbett Research) using SYTO 9 dye (Invitrogen). The sequences of the primers are included in Supplemental Table 1. Random decamer primed cDNA was used for the qPCR experiments involving host genes, hypoxia responsive genes, and Drosha mRNA quantitation. miRNA quantitation was performed using ABI TAQMAN miRNA quantitation kit (Applied Biosystems) according to the manufacturer's protocol. For the identification and quantitation of alternatively spliced transcripts, RT-PCR was performed using oligo-dT primed cDNA. Appropriate minus RT controls were included in every experiment to ensure absence of genomic DNA contamination.
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10

Boric Acid Effects on Saprolegnia

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Saprolegnia spores and zoosporangia were treated with boric acid at 1 g/L (diluted in SAW) for various time periods, 12, 24, 48, 72 and 96 h. At indicated time points BA was replaced with SAW. The ability of treated spores to germinate and colonize sesame seeds was recorded 24 h following the treatment removal. Treated zoosporangia were also examined for their ability to release spore. Spores and zoosporangia in SAW were used as a non-treated control. Results were confirmed with fluorescent microscopy using SYTO 9 dye (Invitrogen) 5 mM solution in DMSO.
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