… may be in the active or inactive state. Active yeasts generally provoke fermentation. They consist essentially of … (almost exclusively of the genus Saccharomyces ), which multiply during alcoholic fermentation. Yeasts may also be … , produced by the propagation under special conditions of specially cultured strains of yeast in a carbohydrate medium …
… still covered with a fine down formed of very short fibres (usually less than 5 mm long). These fibres are known as … or rendered absorbent. They may be presented in bulk or strongly compressed in the form of sheets or slabs. … from the esparto grass ( Stipa tenacissima ) and the grass Lygeum spartum which grow in Africa and Spain. Their main …
… audio‑frequency electric amplifiers of all kinds presented separately, regardless of the particular purpose for which … transmitted by means of a diaphragm, sets up strains in a specially cut piece of crystal (e.g., quartz or rock … in the form of a separate power pack. Power packs presented separately are not classified in this heading ( generally …
… are rotary presses. In their simplest form, these presses usually consist of a cylinder with two semi-cylindrical … scarves or handkerchiefs). (2) Roller printing machines , usually consisting of a large central cylinder (pressure … points on a positively charged photoconductive surface (usually a drum) leaving a positively charged replica of the …
… appliances which, in the vast majority of cases, are used only in professional practice (e.g., by doctors, surgeons, … shears, etc.). Such articles are classified in this heading only when they are clearly identifiable as being for medical …
… or other microscopes ‑ heading 90.11 or 90.12 ), or for analysing materials, or measuring properties such as … ( heading 90.27 ). (b) Instruments or apparatus designed only for ordinary measurement or checking of width, … 90.31 ). The machines and appliances of this heading are generally used in industrial or research laboratories for …
… heating elements. In these heaters water is heated gradually. (3) Dual‑system heaters in which the water is … with a thermostatic control to operate them electrically only when the alternative means is insufficient. (4) … of different shapes and forms depending on their use, are generally used in tanks, vats, etc., for heating liquids, …
… current of different voltage, impedance, etc. These usually consist of two or more coils of insulated wire wound … etc. An AC in one coil (the primary circuit) induces an AC usually at different values of current and voltage in the … circuit). In certain cases (auto transformers) there is only a single coil, part of the winding of which is common …
… ‑ Road tractors for semi-trailers : 8701.21 - ‑ With only compression-ignition internal combustion piston engine … electric motor as motors for propulsion 8701.24 - ‑ With only electric motor for propulsion 8701.29 - ‑ Other 8701.30 … function. The heading does not cover propelling bases specially designed, constructed or reinforced to form an …
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