An improved ultramicro Kjeldahl technique

Boell, E. J.; Shen, Shih‐Chang

doi:10.1016/0014-4827(54)90049-x

Cited by 45 publications

(5 citation statements)

References 2 publications

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“…Nitrogen content was determined by the method of Boell and Shen. 8 All measurements were made with the Cartesian Diver Apparatus modified from that devised by Boellg and Holter.lo Substrates were added from a side drop after the method of Anfinsen and Claff Anaerobic measurements were made under 95 per cent Nz, 5 per cent COn rendered free of oxygen by passage over a column of finely divided copper heated…”

Section: Methodssupporting

confidence: 93%

Aerobic and Anaerobic Carbohydrate Utilization in Normal and Melanotic Fish Pigment Cells*

Humm

1963

Annals of the New York Academy of Sciences

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Section: Methodssupporting

confidence: 93%

Aerobic and Anaerobic Carbohydrate Utilization in Normal and Melanotic Fish Pigment Cells*

Humm

1963

Annals of the New York Academy of Sciences

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“…The nitrogen content (N&-N plus organic-N) of the sediment samples was determined using the method of Boell and Shen (1954) modified for USC in the micro range. Ignition loss was determined by ashing over a Bunsen burner.…”

Section: Bethany Bog Connectlcutmentioning

confidence: 99%

Epiphasic Carotenoids in Post‐Glacial Lake Sediments

Vallentyne

1956

Limnology & Oceanography

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The presence of Q-and p-carotenes in surface mud from Lower Linslev Pond, Connecticut, and Little Round Lake, Ontario, was demonstrated by comparing the chromatographic positions and absorption spectra of the isolated compounds with authentic spccimens of the same compounds prepared from carrots.Seven other carotenes were isolated from the Lower Linsley Pond mud, three of which were probably myxoxanthin, rhodoviolas-

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“…Total nitrogen (TN), nitrate nitrogen (NO 3 -N), and ammonia nitrogen (NH 4 -N) contents were determined by the Kjeldahl method ( Boell and Shen, 1954 ) ( Table 2 ). The soil total organic carbon (TOC) content was measured using a carbon and nitrogen combined analyzer (Multi N/C 2100 s, Jena, Germany) after removing inorganic carbon with 0.5 mol/L dilute hydrochloric acid.…”

Section: Methodsmentioning

confidence: 99%

Effects of water stress on nutrients and enzyme activity in rhizosphere soils of greenhouse grape

Zhang,

Yang

et al. 2024

Front. Microbiol.

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In grape cultivation, incorrect water regulation will lead to significant water wastage, which in turn will change soil structure and disrupt soil nutrient cycling processes. This study aimed to investigate the effects of different water regulation treatments [by setting moderate water stress (W1), mild water stress (W2), and adequate water availability (CK)] on soil physical–chemical properties and enzyme activity in greenhouse grape during the growing season. The result showed that the W2 treatment had a negative impact on the build-up of dissolved organic carbon (DOC), nitrate nitrogen (NO3-N), and available phosphorus (AP). Throughout the reproductive period, the W1 and W2 treatments decreased the soil’s microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) contents, and MBC was more vulnerable to water stress. During the growth period, the trends of urease, catalase, and sucrase activities in different soil depth were ranked as 10–20 cm > 0–10 cm > 20–40 cm. The urease activity in 0–10 cm soil was suppressed by both W1 and W2 treatments, while the invertase activity in various soil layers under W1 treatment differed substantially. The W1 treatment also reduced the catalase activity in the 20–40 cm soil layer in the grape growth season. These findings suggested that W2 treatment can conserve water and enhance microbial ecology of greenhouse grape soils. Therefore, W2 treatment was the most effective water regulation measure for local greenhouse grape cultivation.

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An improved ultramicro Kjeldahl technique

Cited by 45 publications

References 2 publications

Aerobic and Anaerobic Carbohydrate Utilization in Normal and Melanotic Fish Pigment Cells*

Aerobic and Anaerobic Carbohydrate Utilization in Normal and Melanotic Fish Pigment Cells*

Epiphasic Carotenoids in Post‐Glacial Lake Sediments

Effects of water stress on nutrients and enzyme activity in rhizosphere soils of greenhouse grape

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