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Glossary
Noble Hops
The term "noble hops" traditionally refers to varieties of hops which are low in bitterness and high in aroma. They are the European cultivars or races Hallertau, Tettnanger, Spalt, and Saaz.[33] They are not bred as "modern" hop varieties but they are wild hops found and named for a specific region or city in which they were first found or by the farmer which found them or first propagated them. They contain high amounts of the hop oil humulene and low amounts of alpha acids cohumulone and adhumulone, as well as lower amounts of the harsher-tasting beta acids lupulone, colupulone, and adlupulone.[citation needed]
Their low relative bitterness but strong aroma are often distinguishing characteristics of European-style lager beer, such as Pilsener, Dunkel, and Oktoberfest/Märzen. In beer, they are considered aroma hops (as opposed to bittering hops); see Pilsner Urquell as a classic example of the Bohemian Pilsener style, which showcases noble hops.
As with grapes, the location where hops are grown affects the hops' characteristics. Much as Dortmunder beer may within the EU be labelled "Dortmunder" only if it has been brewed in Dortmund, noble hops may officially be considered "noble" only if they were grown in the areas for which the hop varieties (races) were named.
English noble varieties are Fuggle, East Kent Goldings and Goldings. They are characterized through analysis as having an alpha:beta ratio of 1:1, low alpha-acid levels (2–5%) with a low cohumulone content, low myrcene in the hop oil, high humulene in the oil, a ratio of humulene:caryophyllene above three, and poor storability resulting in them being more prone to oxidation. In reality, this means they have a relatively consistent bittering potential as they age, due to beta-acid oxidation, and a flavour that improves as they age during periods of poor storage.[34]
Hallertau or Hallertauer–The original German lager hop; named after Hallertau or Holledau region in central Bavaria. Due to susceptibility to crop disease, it was largely replaced by Hersbrucker in the 1970s and 1980s. (Alpha acid 3.5–5.5% / beta acid 3–4%)
Žatec–Noble hop used extensively in Bohemia to flavor pale Czech lagers such as Pilsner Urquell. Soft aroma and bitterness. (Alpha acid 3–4.5% /Beta acid 3–4.5%)
Spalt–Traditional German noble hop from the Spalter region south of Nuremberg. With a delicate, spicy aroma. (Alpha acid 4–5% / beta acid 4–5%)
Tettnang–Comes from Tettnang, a small town in southern Baden-Württemberg in Germany. The region produces significant quantities of hops, and ships them to breweries throughout the world. Noble German dual-use hop used in European pale lagers, sometimes with Hallertau. Soft bitterness. (Alpha acid 3.5–5.5% / beta acid 3.5–5.5%)
PVC (polyvinyl chloride)
Polyvinyl chloride, more correctly but unusually poly(vinyl chloride), commonly abbreviated PVC, is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
PVC (polyvinyl chloride) is a common, low-cost plastic used in tens of thousands of products including plastic wrappers, vinyl fabrics, paint, pipes, and siding. It's all around us. Without additives or contaminants, pure PVC is actually non-toxic, but when turned into products, it's almost exclusively combined with chemicals and plasticizers. These combinations make it bad stuff for us and the planet.
When PVC is manufactured, it produces potent carcinogens and toxins including dioxins, chlorine residue, and heavy-metal pollutants. Over their lifespan, PVC products can off-gas and leak dangerous additives. PVC is also difficult to recycle; most of it ends up in landfills. When burned, it releases further dioxins and gases such as hydrogen chloride.
PVC comes in two basic forms: rigid (sometimes abbreviated as RPVC) and flexible. The rigid form of PVC is used in construction for pipe and in profile applications such as doors and windows. It is also used for bottles, other non-food packaging, and cards (such as bank or membership cards). It can be made softer and more flexible by the addition of plasticizers, the most widely used being phthalates. In this form, it is also used in plumbing, electrical cable insulation, imitation leather, signage, inflatable products, and many applications where it replaces rubber.
Pure poly(vinyl chloride) is a white, brittle solid. It is insoluble in alcohol but slightly soluble in tetrahydrofuran.
ppm (parts per million)
ppm - parts per million - is commonly used as unit of concentration and equivalent to milligrams per liter (mg/l)
parts per million - ppm - is commonly used as a measure of small levels of pollutants in air, water, body fluids, etc. Parts per million is the mass ratio between the pollutant component and the solution and ppm is defined as
ppm = 1,000,000 mc / ms (1)
where
mc = mass of component (kg, lbm)
ms = mass of solution (kg, lbm)
In the metric system ppm can be expressed in terms of milligram versus kg where
1 mg/kg = 1 part per million
ppm can be also be expressed as:
1 ppm = 0.0001 %
1 000 ppm = 0.1 %
10 000 ppm = 1%
Plato scale
Professional brewers often use the Plato (oP) scale, instead of specific gravity, as a measure of the sugar levels in wort and beer. Very roughly, a 1.004 Specific Gravity (SG) is equivalent to 1° Plato (1% sucrose) and 1.040 to 10° Plato (10% sucrose). In other words, each Plato degree accounts for 0.004 Specific Gravity. To convert Specific Gravity to Plato, divide the digits to the right of the decimal point by 4. For example, 1.044 is 11° Plato and 1.054 is 13.5° Plato. There will not be a quiz on this.
Protein content
The percentage of the malt grain that is protein.
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Professional Assistance
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-0.46%
0.0059
0.0108