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A test tube is a small glass bottle used in scientific experiments. Its narrow neck and spherical bottom make it a convenient container for capturing gases and heating them to high temperatures. The tubes are often sterilized using alcohol burners and Bunsen burners and are referred to as "in vitro" or "test tubes". Many chemists use test tubes for in vitro fertilization, allowing them to produce the first celebrity baby.

A test tube is used in a variety of lab experiments. The most common type is the vacutainer. These are filled with a physiological fluid sample and are often sealed with a rubber stopper. Some of the vacutainers contain specific additives to make the sample more stable. For example, blue-top tubes contain sodium citrate and are used in coagulation and glucose-6-phosphate dehydrogenase testing. Some chemistry test tubes are small, with a hinged cap.

Vacutainers are sterile test tubes that have been capped and have the air removed. These tubes are used for physiological fluid samples. Some of these tubes contain a specific additive. For example, the blue-top tube contains sodium citrate and is used for coagulation tests. Another type of in vitro test tube is a small vial that has a hinge cap. In vitro fertilization is a safe procedure, but there are still risks involved.

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In the early 20th century, test-tube babies began to gain public attention. Several articles appeared in newspapers and magazines discussing the ethics of this procedure. Some were written in Scientific American and Newsweek. These publications addressed the ethical issues surrounding test-tube babies. The public's understanding of reproductive technology was shaped by these articles. Fortunately, there were many successful test-tube babies. However, the process of creating these babies wasn't always as simple as it seems.

In the laboratory, test tubes are also called culture tubes and finger-like lengths of glass. They are a multipurpose tool that can be used to hold a single test tube. A glass tube holder can be used to store and transport up to four different test tubes. The jaws on the test tube can be interlocked or open or closed depending on the purpose. A slanted test tube holder is best for drying.