Indeed, AIDS is nowadays a global concern and it reaches the entire public. No one can actually feel secure from the illness. However, we may also notice that the article is pretty basic, giving out primary information, which may induce us to believe that it is rather directed towards teenagers or people with lesser knowledge on AIDS. 3. "Identification of Herpesvirus-Like DNA Sequences in AIDS-Associated Kaposi's Sarcoma" from Science (16 December 1994

The first observation that needs to be made here is that the language used is very technical: many terms from chemistry, biology and anatomy. This is quite clear from the very beginning, when the author mentions among the agents suspect of causing Kaposi's sarcoma things like "cytomegalovirus, hepatitis B virus or human herpes virus 6."

Further more, the tone used throughout the paper is extremely precise and scientific, as it describes chemical reactions used to identify certain DNA sequences and mechanisms such as polymerase chain reaction (PCR). The author uses several figures throughout the article to make his point clear and these include some of the sequences obtained. The figures are extensively commented in sideline textboxes (see Figures 1 and 2).

Additionally, the author does not hold back from presenting some of the statistical data and implications of his tests and experiment. This include statistical tests and results.

Everything presented here above lead us to believe that this paper is a highly scientific paper that is addressing scientists working in this area. A high knowledge of the facts discussed is necessary in order to understand what...

The audience is formed of a very small group of informed, well documented persons, who work with these matters on a daily basis. The article has a clear research goal and wants to share with the scientific community the discovery of the analysis.
4. "Laboratory Safety for Handling of Blood and Body Fluids"

The article here presents several recommendations and rules related to handling blood and to behavior in the laboratory. The tone and phrases used are clearly pointed this out, as we shall se here below.

First of all, we should point out that the style is formal, as the article organizes a strict set of rules that need to be applied in the laboratory. There are no twists in phrases, these are clear and straightforward, aimed at briefly delivering the message to the audience.

The words used are also following the same pattern. Notice, for example, that most of the verbs are used in the imperative form: "limit," "wear," "wash," "decontaminate," "wear." The use of verbs in the imperative is generally common when describing a set of rules, as these verbs tend to give out a strong message and impose one's will.

The vocabulary used is not too complicated, but extremely precise and limited to a certain area of activity. The entire text is addressing the persons that are operating the human blood or blood products in the laboratory. The audience is well acquainted with the instruments and products it is operating and this is a priori assumed. As such, the writer of this text is most of all interested in delivering the set of rules to his auditorium.