Si 234

Manufactured by Sartorius

Sourced in United States

The Si-234 is a versatile laboratory equipment that serves as a high-precision weighing scale. It features a wide range of weighing capacities and accurate readability, making it suitable for various scientific and industrial applications. The core function of the Si-234 is to provide reliable and precise measurements of sample weights.

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Lab products found in correlation

Digital caliper, by Mitutoyo (1 mentions) Alpha 2 4 lsc plus, by Martin Christ (1 mentions) Li 3100c, by LI COR (1 mentions) Li 3100, by LI COR (1 mentions)

6 protocols using si 234

Measuring Morphometrics of Turtle Specimens

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Prior to recording ABRs, the body mass of all turtle specimens was recorded using an electronic balance [SI-234, Denver Instrument (Beijing) Co., Ltd., Beijing, China], whereas the tympanum diameter (Fig. 1) and carapace length were measured using a Mitutoyo digital caliper (500-196-30, Mitutoyo Corp., Kawasaki-shi, Kanagawa Prefecture, Japan).Fig. 1

Measurements of the diameter of the tympanum from a male turtle. Inset: schematic diagram showing how the tympanum diameter was measured

Wang T., Li H., Cui J., Zhai X., Shi H, & Wang J. (2019). Auditory brainstem responses in the red-eared slider Trachemys scripta elegans (Testudoformes: Emydidae) reveal sexually dimorphic hearing sensitivity. Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology, 205(6), 847-854.

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Measuring Shoot Growth Under UV-B Exposure

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Shoots were harvested on days 2, 4, and 6 of the UV-B treatment, and shoot fresh and dry weights were measured to assess changes in shoot growth according to the applied energy levels of UV-B light. After two hours after UV-B lamps were turned off, the shoot and root were separated and collected at the basal end of plants. Shoot fresh weight was measured using an electronic scale (Si-234, Denver Instrument, Bohemia, NY, USA) and shoot dry weight was measured after freeze-drying at −75 °C for over 72 h using a lyophilizer (Alpha 2-4 LSCplus, CHRIST, Osterode am Harz, Germany).

Park S.Y., Lee M.Y., Lee C.H, & Oh M.M. (2020). Physiologic and Metabolic Changes in Crepidiastrum denticulatum According to Different Energy Levels of UV-B Radiation. International Journal of Molecular Sciences, 21(19), 7134.

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Destructive Measurements for Lettuce Growth

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For the growth and morphology analysis, destructive measurements were taken on five plants of each treatment on day 20 after transplanting. Lettuce samples were separated into shoot and root using sharp scalpels and forceps. The stem length was the average value of stem lengths in fully expanded leaves of each plant. The leaf area was measured by an area meter (LI-3100C, LI-COR Biosciences, Lincoln, NE, USA). The fresh and dry weights of shoot and roots were measured by an electronic balance (Si-234; Denver Instrument, Bohemia, NY, USA). Whole-plant net assimilation was calculated by dividing shoot dry weight by total leaf area for each plant.

Li L., Tong Y.X., Lu J.L., Li Y.M., Liu X, & Cheng R.F. (2021). Morphology, Photosynthetic Traits, and Nutritional Quality of Lettuce Plants as Affected by Green Light Substituting Proportion of Blue and Red Light. Frontiers in Plant Science, 12, 627311.

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Light Spectrum Effects on Lettuce Seedlings

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Seedlings treated with ten different light spectra for 2 weeks were investigated for shoot fresh and dry weights, root dry weight, leaf area, projected leaf area, and SPAD value. Shoot fresh and dry weights and root dry weight were measured with an electronic scale (Si-234, Denver Instrument, NY, USA). To measure dry weight, shoots and roots of lettuce plants were dried in an air oven at 70 °C for over 3 days. Leaf area was measured using a leaf area meter (LI-3100, LI-COR). Specific leaf area was calculated by dividing the total leaf area by shoot fresh weight. The projected leaf area was obtained from a top-view image of plants by segmented pixels of the G channel in MATLAB (R2019a, Mathworks Inc., MA, USA) software. The average value of three measurements in fully expanded leaves per plant was used for the SPAD value (SPAD-502; Minolta Corporation, Ltd., Osaka, Japan). For the identical growth parameters, five and eight replicates were used for each light treatment at the end of the seedling stage and at harvest (4 weeks after transplanting), respectively. The number of replicates was the same for both exp.1 and exp. 2.

Lim E., Kim J.O, & Oh M.M. (2023). Optimizing the photon ratio of red, green, and blue LEDs for lettuce seedlings: a mixture design approach. Plant Methods, 19, 121.

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Lettuce Growth Measurement Protocol

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Five lettuce samples were measured on day 21 after transplanting. Plants were dried with absorbent paper. Each plant was separated into the shoot and root using a sharp scalpel and forceps. Leaf area was measured by an area meter (LI-3100C; Lincoln, NE). The shoot fresh weight and shoot dry weight were measured using an electronic balance (Si-234; Denver Instrument, NY).

Lie L., Tong Y., Jiang L., Li Y., & Yang Q. (2020). Lettuce Growth, Nutritional Quality, and Energy Use Efficiency as Affected by Red–Blue Light Combined with Different Monochromatic Wavelengths. HortScience, 55(5), 613-620.

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Characterizing Adventitious Root Formation

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The tray bottom was checked daily from 12 DAT onward for ARs, and cuttings were harvested at 22 DAT. The substrate was removed from the rooted cuttings by washing with water. The average length of ARs was determined with a measuring tape (STHT-36127, Stanley Electric Co., Ltd., Tianjin, China), and the average fresh weight of ARs was measured using an electronic scale (Si-234, Denver Instrument, Bohemia, NY, USA). The average AR number was also counted. The AR generation rate was calculated as the percentage of rooted cuttings in each treatment. All AR characteristics were determined at 22 DAT on eighteen cuttings per replication (n = 18).

Lam V.P., Hernández R., Lee J., Kim S.J., & Park J.S. (2022). Generation of Adventitious Roots and Characteristics of Gas Exchange according to Leaf Number of Hemp (Cannabis sativa L.) Cuttings. Horticultural Science and Technology, 40(1), 30-38.

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