A single-cell organism or plant that feeds on simple sugars that are converted into alcohol and carbon dioxide through fermentation. Yeast is used as an activator to start various reactions necessary to produce alchoholic beverages and baked goods. In alcoholic beverages, it is a key enabler for the fermentation of grains resulting in the creation of alcohol and carbonation common in wine, beer, and other beverages.
Feel Pregnant but the Pregnancy Test is Negative? Nausea and vomiting. Generally speaking the nausea and vomiting of pregnancy are presumed to start about four weeks from conception. Some other causes of nausea and vomiting are viral, or bacterial, infections in the bowel.
A negative result on a home pregnancy test COULD mean that you are not pregnant, that the test was performed too early, or that there was a problem with the technique or timing. If you suspect that you are pregnant and that you received a false negative, wait for a few days and test again. If you obtain different results with other home pregnancy tests, it is highly recommended that you contact a healthcare professional and have more specific tests done to get a definite answer.