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[2] [3] [4] The term dialysis was first routinely used for scientific or medical purposes in the late 1800s and early 1900s, pioneered by the work of Thomas Graham. The first mass-produced man-made membranes suitable for dialysis were not available until the 1930s, based on materials used in the food packaging industry such as cellophane.
Cavatappi is a generic name adopted by other brands that imitated Barilla's cellentani. This particular shape was born in the 1970s at Barilla in Parma, [5] when a set of pasta dies had been mistakenly made with a spiral (instead of straight) set of lines. These produced pasta in a spiral or spring (molla in Italian) shape.
Dialysis tubing is typically supplied either wet or dry in rolls or pleated telescoped tubes. A wide variety of dialysis devices (or dialyzers) are available from several vendors. Dialyzers are designed for specific sample volume ranges and provide greater sample security and improved ease of use and performance for dialysis experiments over ...
Microwave digestion is a chemical technique used to decompose sample material into a solution suitable for quantitative elemental analysis. [1] It is commonly used to prepare samples for analysis using inductively coupled plasma mass spectrometry (ICP-MS) , atomic absorption spectroscopy , and atomic emission spectroscopy (including ICP-AES ).
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This combination of the two digestates consists as a sludge form. The liquid fraction constitutes up to 90% of the digestate by volume, contains 2–6% dry matter, particles <1.2 mm in size, and most of the soluble nitrogen and potassium, while the solid fraction retains most of the digestate phosphorus, and contains dry matter content ˃ 15%. [3]
An undesirable side effect of the use of proteolytic enzymes is the self digestion of the protease. To avoid this, in the past Ca 2+-ions were added to the digestion buffer. [23] [24] Nowadays most suppliers offer modified trypsin where selective methylation of the lysines limits the autolytic activity to the arginine cutting sites. [25]
C + 2 H 2 SO 4 → CO 2 + 2 SO 2 + 2 H 2 O S + 2 H 2 SO 4 → 3 SO 2 + 2 H 2 O. Catalysts like selenium, Hg 2 SO 4 or CuSO 4 are often added to make the digestion go faster. Na 2 SO 4 or K 2 SO 4 is also added to increase the boiling point of H 2 SO 4. Digestion is complete when the liquor clarifies with the release of fumes. [3] A distillation ...