| German |
|
English |
Comments |
|
Dampfsperr
|
|
Steam barrier
|
Typically, a penetration into a fermentor
(e. g., a stirrer shaft) which is surrounded by a steam jacket to prevent
microbial contamination. More specifically, the steam jacket itself.
|
|
DANS
|
|
DANS
|
Dimethylaminonaphthalenesulfonic acid
|
|
DAP
|
|
DAP
|
Diaminopimelic acid
|
|
Dauerform
|
|
Resistant form
|
|
|
Dauerform
|
|
Survival form
|
Commonly spores or cysts
|
|
Deckel
|
|
Lid
|
of a fermentor, for instance
|
|
Deckglas
|
|
Cover slip
|
Thin glass, circular, square, or
rectangular, used to cover object(s) being examined with an optical
microscope. Required for some optical systems. Thickness is important:
No. 1:0.13 - 0.16 mm
No. 1½: 0.16 - 0.19 mm
No. 2:0.19 - 0.25 mm
|
|
Dekanter
|
|
Decanter; but see note
|
In US usage, a decanter is a system in
which two dispersed immiscible liquids separate by gravity and the two phases
are withdrawn separately. In German usage, a decanter is (or may be) a
centrifuge with a horizontal axis and a spiral auger which removes sedimented
solids.
|
|
Del Faktor
|
|
q
|
ln (N0/N);ln (inactivation factor)
|
|
Denitrifikanten
|
|
Denitrifying bacteria
|
Aerobic bacteria which can grow
anaerobically by using nitrate (NO3-) as an oxygen
source, producing N2 or N2O
|
|
Denitrifikation
|
|
Denitrification
|
Microbial use of the oxygen of nitrate,
releasing free nitrogen
|
|
Desinfektionsmittel
|
adj
|
Disinfectant
|
Implies destruction of pathogens; not
synonymous with ‘sterilant’
|
|
Desinfizierung
|
|
Disinfection
|
Implies destruction of pathogens; not
synonymous with ‘sterilization’.
|
|
destilliert
|
f
|
Distilled
|
|
|
Dextran
|
pl. Dextrane
|
Dextran, dextrans
|
Varous polymers of glucose, 1,6- linked,
and with various other linkages. Not the same as dextrin
|
|
Dextrin
|
|
Dextrin
|
A partially hydrolyzed starch; a
1-4-linked polymer of glucose. Not the same as dextran.
|
|
dezimale Reduktionszeit
|
|
Decimal reduction time
|
Time required to reduce a microbial
population to one-tenth its initial value (by heat treatment, for instance)
|
|
Diacetyl
|
|
Diacetyl
|
CH3-CO-CO-CH3
|
|
Diaminopimelinsäure
|
|
Diaminopimelic acid
|
|
|
Diatomenerde
|
|
Diatomaceous earth
|
Kieselguhr;common filter aid
|
|
Diauxie
|
|
Diauxy, diauxie
|
Growth in two steps using a preferred
substrate first followed by a less preferred one (two log phases separated by
a lag phase).
|
|
Dichtegradient
|
|
Density gradient
|
|
|
Dichtung
|
f
|
Gasket
|
|
|
Dichtung
|
f
|
Packing
|
Seal, usually for a rotating shaft
|
|
Dichtung
|
f
|
Seal
|
|
|
Dichtungsring
|
m
|
Sealing ring
|
|
|
Difco
|
|
Difco
|
US manufacturer of microbiological media
|
|
Dispersier(gerät)
|
|
Disperser
|
|
|
DMRL
|
|
DMRL
|
7,6-dimethyl-8-ribityllumazine
|
|
DNS
|
|
DNA
|
Deoxyribonucleic acid
|
|
doppelt destilliert
|
adj
|
Double-distilled
|
|
|
Dosier-
|
|
Metering
|
Addition of measured/controlled volume;
proportioning; generally not ‘dosing’ in US usage.
|
|
Dosierpumpe
|
f
|
Metering pump
|
|
|
Dowex
|
|
Dowex
|
A family of ion-exchange resins from the
Dow Chemical Company
|
|
Druckluft
|
f
|
Compressed air
|
|
|
Dunkelfeld
|
|
Dark field
|
A microscope optical system which makes
small clear and colorless objects (e. g., bacteria) visible. The object is
illuminated by light at an angle such that no light enters the microscope
system except that which is diffracted by particles.
|
|
Dunkelstoffwechsel
|
|
Dark metabolism
|
Metabolism of photosynthetic organisms in
the absence of light
|
|
Dünnschichttrockner
|
|
Thin-film drier
|
|
|
Durchflusscytometrie
|
|
Flow cytometry
|
Making measurements on individual cells,
usually with a laser beam, as the cells flow in a thin stream; often coupled
with automatic separation of the cells based on the values measured.
|
|
Durchsatz
|
|
Throughput
|
|
|
Durham Röhrchen
|
|
Durham tube(s)
|
Small test tubes placed, mouth down,
inside broth culture tubes. After autoclaving, they are full of broth. If the
culture produces gas, a bubble collects inside the tube.
|
|
D-wert
|
|
Decimal reduction time; D
|
‘dezimale Reduktionszeit’; D10;
time required to kill 90% of cells under specified conditions (especially
temperature)
|
Copyright © 2010 Denzel Dyer, all rights reserved.
