The document discusses two studies: one on cassava starch separation in Colombia and one on sexual risk in Spanish adolescents depending on age of sexual debut. The cassava study evaluated sedimentation processes in channels used to separate starch from slurry, finding particle sizes between 6.7-8.8 um were discharged into water. The sexual risk study analyzed protection methods used among Spanish teens based on debut age, finding debut before 15 associated with increased risk behaviors and partner numbers.

2. Cassava Starch Separation
The parts:
-Background
-Purpose ando focus
-Methods
-Results
-Conclusions
Abstract: Cassava Starch Separation
Background:
The production of the cassava starch in Colombia
comes mainly from the nothern region of the Cauca
Departament in small agricultural industries know as
“rallanderias”, in wichi the settling of the slurry accurs
in channels.

3. Purpose and focus
It is important to evaluate the
sedimentation process
performed in rectangular
channels (0.3 high; 0.4 wide; 165
m long), wich are generally used
in the region.

4. Methods
Two main components were
evaluated: determination of the
change in the concentration of the
slurry entering the settling zone and
determination of the particle size
distribution in the settling zone.

5. Results
It was found that the concentracion of
the slurry during strainer operation
was between 0.1 to 6% most of the
time; the settling of discrete particles,
for wich to Stokes Law may be
applied, predominated.

6. Conclusions
Particles between 6.7 to 8.8 um were
not retained and were discharged into
local bodies of water, generating
environmental problems

7. Sexual Risk in adolescents dependin on the age of sexual debut
Background
In Spain young people have their first sexual intercourse
at an earlier age than in other countries.
Purpose and focus
Sexual practices and methods of protection are analyzed
depending on the age of sexual debut among spanis
adolescents who are sexually experienced. The mean
age was 15,9 years.

8. Methods
The early sexual debut group reported
further mutual masturbation, original
intercourse and oral sex with a higher
number of sexual patners than the rest.

9. Results
Sexual debut before 15 years old was
associated with increased risk of sexual
infections, deficit in condom use and
increased sexual expore.
Conclusions
The findings of this estudy suggest that
the age of sexual debut has implication for
the sexual health in young people.