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Od600 diluphotometer

Manufactured by Implen
Sourced in Germany

The OD600 DiluPhotometer is a compact and versatile spectrophotometer designed for measuring the optical density (OD) of bacterial and microbial cultures at a wavelength of 600 nm. It provides accurate and reliable measurements of cell density, which is a crucial parameter in various microbiology and biotechnology applications.

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12 protocols using od600 diluphotometer

1

Cultivation of Uropathogenic E. coli Reporters

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The tcpC-deficient reporter strain CFT073 tcpC::gfpmut2, and plasmid-transformed CFT073 reporter strains were cultured overnight at 37 °C and 200 rpm in LB medium or M9 minimal medium containing glucose in the presence of ampicillin (100 μg/mL) or kanamycin (25 μg/mL); wild-type CFT073 was cultured in the absence of antibiotics.
Bacterial growth was determined by measuring the optical density using an OD600 DiluPhotometer (IMPLEN, Munich, Germany).
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2

Growth Kinetics of E. coli under Antibiotics

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For Supplementary Fig. 8, growth curves of E. coli TOP10 cells were obtained using the BioTek Synergy™ H4 plate reader. Briefly, 120 μL of nutrient broth (LB) with and without antibiotic(s) were administered into the wells of a flat-bottom 96-well plate. The overnight bacterial cultures were used to inoculate fresh cultures into the 96-well plate with an optical density (OD600) of 0.01. To avoid evaporation of the medium during measurements, the plate was closed with a lid and the sides were wrapped with parafilm tape. The reader was driven by Gen5 v2.01.14 software (temperature = 37 oC, run time = 20 h, read interval = 2 min and 43 s, wavelength = 600 nm, shake = slow, shake once every 130 s, read = absorbance end point, read speed = normal and delay = 100 msec). The reader was preheated before the start of the experiment. Chloramphenicol, ampicillin and kanamycin were used at a final concentration of 35 μg/mL, 100 μg/mL and 50 μg/mL, respectively. For Supplementary Fig. 15, growth curves were measured in 100 mL conical flasks containing 20 mL of cultures in LB with the corresponding antibiotics incubated at 37 oC with shaking (220 rpm). Cultures were started with an OD600 of 0.1 and were grown until OD600 = 0.5 after which 0.1% arabinose and 100 μM IPTG were added. Absorbance was measured at regular intervals using OD600 DiluPhotometer™ (IMPLEN).
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3

Bacterial Growth Measurement by OD600

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Bacterial growth was determined by measuring the optical density using an OD600 DiluPhotometer (IMPLEN, Munich, Germany).
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4

Culturing E. coli BL21 to OD600 Milestones

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The E. coli BL21 strain was cultured overnight in 250 mL of lysogeny broth (LB) (5 g/L NaCl, 5 g/L yeast and 10 g/L tryptone) at 37 °C at 250 rpm in a 500 mL Erlenmeyer flask. After that, 1.5 mL of this overnight culture was used to inoculate 150 mL of LB, which was then cultured under the same growth conditions. Cells were harvested when an optical density (OD) of 1 at 600 nm was reached (i.e., the EGP) and once the cells had reached SGP conditions (OD of 4.6), after which no further increase in OD was observed. OD was checked periodically using 1 mL of culture and an OD600 DiluPhotometer (Implen).
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5

Bacterial Filtration Evaluation Protocol

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Bacteria cells (E. coli) were cultured overnight in LB broth at 37 °C with shaking (180 rpm) until the desired optical density (OD) was reached. For treatment of filter materials with E. coli, first, filter paper was cut into small squares to fit into 150 mm cell culture dishes (ThermoFisher, Waltham, MA). One filter paper was added to each culture dish, and one square of control or treated filter material was placed on top of the filter paper. Each sample material was treated with a 50 μL drop of E. coli (1 × 107 CFU/mL). After 1.5 hours of treatment, the tested filter material was removed and the remaining filter papers were placed in 50 mL sample tubes containing 10 mL of LB broth to incubate for 8 hours at 37 °C with shaking (180 rpm). Following incubation, growth of E. coli was measured using an Implen OD600 DiluPhotometer.
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6

Mapping Maltotriose Utilization Genes

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60 spores from 15 fully viable tetrads of strain yHEB1593 (F1 of yHKS210 x yHEB1505) were dissected and individually screened for their ability to grow in SC + 2% maltotriose. F2 segregants that could grow on maltotriose were classified as MalTri+, and those that could not were classified as MalTri-. Each F2 segregant was then individually grown to saturation in liquid YPD. The saturated cultures were spun down, the supernatant removed, and enough cells resuspended in liquid SC medium to give an OD600 measurement of between 1.9 and 1.95, as measured with an IMPLEN OD600 DiluPhotometer. Strains were pooled based on their ability to grow on maltotriose, forming a MalTri+ pool and a MalTri- pool. To pool, 1mL of each strain dilution was added to the appropriate pool of cells and vortexed to mix. Phenol-chloroform extraction and ethanol precipitation was used to isolate gDNA from the segregant pools. The gDNA was sonicated and ligated to Illumina TruSeq-style dual adapters and index sequencing primers using the NEBNext DNA Library Prep Master Mix Set for Illumina kit following the manufacturer’s instructions. The paired-end libraries were sequenced on an Illumina MiSeq instrument, conducting a 2 x 250bp run.
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7

Phage Infection Kinetics in TBM

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TBM medium was inoculated with single colonies and cultures were allowed to grow until OD600 reached 0.2–0.3. Phage was added to the MOI of 5 and growth was allowed to continue. OD600 measurements were carried out with OD600 DiluPhotometer (Implen) every 20 min during the first hour, and then at 2 and 3 h post-infection. Growth of uninfected cultures was monitored in parallel.
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8

Anaerobic Growth of Gut Bacteria

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All bacteria were grown in anaerobic serum bottles sealed with butyl-rubber stoppers at 37 °C with N2:CO2 (80:20 ratio) in the headspace at 1.5 atm. Bacterial pre-cultures were prepared by overnight growth in: minimal media supplemented with type III hog gastric mucin (Sigma-Aldrich, St. Louis, USA) for A. muciniphila MucT (ATCC BAA-835)(Derrien et al. 2004 (link)), and peptone yeast glucose (PYG) medium for A. caccae L1-92 (DSM 14662) (Schwiertz et al. 2002 (link)). Growth was measured by spectrophotometer as optical density at 600 nm (OD600) (OD600 DiluPhotometer™, IMPLEN, Germany).
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9

Growth and Preparation of Anaerobic Bacteria

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Fusobacterium nucleatum subsp. nucleatum ATCC 23726 was grown under anaerobic conditions19 (link). Frozen cultures of bacteria were streaked on solid agar plates made with Columbia broth (Gibco) substituted with hemin (5 μg/mL) and menadione (0.5 μg/mL) (CBHK) and grown in an anaerobic chamber (90% N2, 10% H2, and 10% CO2) at 37 °C (Whitley A35 anaerobic workstation). Single colonies were then retrieved and inoculated in liquid cultures of CBHK media and grown for ~16 h anaerobically to reach a mid-exponential growth phase. The optical density at 600 nm was measured to be 0.5 (Implen OD600 DiluPhotometer) and the bacteria were resuspended in PBS and used for the experiments.
Escherichia coli TOP 10 was grown in Luria Broth (LB) in a shaker incubated at 37 °C overnight. Bacterial culture was diluted to an optical density (600 nm) of 0.5 before being used for experiments.
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10

Peptide-Mediated Agglutination of Gram-Positive Bacteria

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The agglutination of Gram-positive bacteria was studied using S. aureus (DSM 346 and ATCC 29213) as a model bacterium for evaluating the different peptides, as recently described by Bikker et al. [24 (link)] with PepA to PepE. Briefly, 180 µL of the previously adjusted bacterial suspension were added to each well of a 96-well round-bottom microplate (Sarstedt, Nümbrecht, Germany and Greiner Bio-One). An amount of 20 µL of peptide solution was added to reach a final peptide concentration of 0.1 mM. The plates were then incubated at 37 °C. After 30 min, pictures of the bottom of the plates were taken to examine the agglutination. Further, turbidometric analysis of the agglutination process was carried out using a spectrophotometer (OD600 DiluPhotometer, Implen GmbH, München, Germany). S. aureus and S. pneumoniae, adjusted to an OD600 of 1.0 as described before [25 (link)], were incubated for a period of 2 h at 37 °C after peptides were added under gentle shaking at 250 rpm to prevent sedimentation or auto-agglutination. The optical density of the bacterial suspensions was monitored at 600 nm for 120 min at 37 °C. All experiments were performed in triplicates and PBS was used as a control for both experiments.
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