Daphnia Magna are small crustaceans that are excellent for observing the effect of depressants on their nervous system. The purpose of this specific experiment is to observe the effect of ethanol, aspirin, and caffeine on daphnia’s heart rate. Not only do these chemicals affect heart rate, but they also affect the frequency of reproduction, number of eggs produced, and body structure. Pesticides similar to these chemicals can be released into the environment and daphnia re useful in monitoring toxicity levels. The agents being tested in this experiment can be administered to determine the effects of hormones, stimulants, antidepressants, and neurotransmitters.
Adrian Molina December 1, 2015 Biology Lab The Affect of Cigarette Extract on Food Vacuole Introduction a. background Tetrahymena are Single celled cicilated protists, which are known to tolerate a diverse range of environments. Tetrahymena are often used in experiments because they are easy to culture and have similar life processes as multicellular organisms. Tetrahymena is covered with short hair-like projections or cilia, that sweep food particles into its oral groove.
Introduction The bean beetle also known as the Callosobruchus maculatus, is an agricultural pest insect from Africa and Asia. That can be found throughout the tropical and subtropical regions. The lifecycle of a bean beetles is quite short an adult been beetle lays their eggs on the external surface of a bean. The larva hatches from the egg burrows from the egg through the seed coat and into the bean endosperm without moving outside the protection of the egg.
In our experiment, we examined the behavior of isopods by conducting the experiment based on our hypothesis: “If ten isopods are put into the test chamber, 5 in sand and 5 in soil, which environment will the pillbug prefer.” We hypothesized that the isopods would favor the soil more than the sand because pillbugs are typically found in soil and not in sand. Pillbugs are favored in soil because the natural role of a pillbug is to eat dead and decaying things but, in sand there are no nutrients available for pillbugs. Pill bugs are mostly found in moist environments, due to having gills, gills only function when they are wet so pill bugs will inhabit places in which air holds a lot of water
The pipette was used to put the water into the behavior tray to create the wet environment in the second part of the lab. The water was used to create the wet environment. The procedure for the control part of the experiment starts by taking the Animal Behavior Tray and placing the filter paper in both sides of it. Next take the five Pill Bugs and place them into the behavior tray. Start the timer on the watch and observe the amount of Pill Bugs on each side of the behavior tray and how they are acting.
Introduction It is well known that metabolic rate and environmental temperature positively correlate to one another in poikilothermic organisms. In the experiment, it was hypothesized that, if environmental temperature is increased, then the rate of biochemical processes will steadily increase, positively correlating with CO2 production and respiration rates in order for the cockroach, a poikilothermic organism, to achieve equilibrium with the environment. Whereas in comparison to a cockroach exposed to standard lab conditions in a stable environment, biochemical processes should remain constant. Methods: In order to conduct the experiment for observing respiration rates of poikilothermic roaches, carbon dioxide/min/gram was measured by cataloging the production of carbon dioxide/min/gram of two separate
The Jumping Bean Beetles! The Jumping bean beetles experiment was done to study the oviposition in bean beetles, and whether it is based on the heritage of the bean beetle. The study consisted of two different types of beans and several mung raised bean beetles.
Stimulants and Depressants How do stimulants and depressants affect a Lumbriculus worm? These questions are answered with the Lumbriculus worm lab. Stimulants and depressants affect the system in different ways. Stimulants make neurons fire faster, and depressants make neurons fire slower. The nervous system of a Lumbriculus worm is very exposed and visible, so different plants and herbs were tested to see how it would affect the heart rate of the Lumbriculus worm.
The effects of where these larvae are laid can dictate the fate of these gall fly larvae. A study shows that avian predators can assess a gall 's content prior to pecking it open, preferring galls that are inhabited by gall fly larvae. Bird predation was found to be concentrated near the places with a lot of tree cover where S. gigantean a large centipede tends to pray few attacks occurred in the open where golden rods are prevalent. The study was a field experiment to observe the preference of avian predators on galls in different habitat types and that had different sizes, and heights of galls. It is possible that birds have either learned through experience or evolved through natural selection to choose the more profitable galls (Poff et al. 2002).
We hypothesized that men with apparently clinically localized CaP harboring occult metastases would also have elevated plasma levels of components of the uPA system of plasminogen activation that would be associated with a higher risk of biochemical progression despite effective local control of disease. Therefore, to determine the relationship of the major components of the uPA system with established markers of CaP presence, invasion, metastasis, and progression, we studied pre- and postoperative plasma levels of uPA and uPAR in patients with clinically localized CaP who underwent radical prostatectomy, patients with CaP metastases to regional lymph nodes, patients with newly diagnosed CaP metastases to bone, and healthy men. The availability of pre- and
Natural Selection is the concept that organisms better adapted to their environment tend to survive and produce more offspring. This leads to the creation of populations and diversity of life within them. In the Skittlefish Lab, many separate occurrences can be observed which detail and explain how Natural Selection works on a population over a period of time. Certain adaptations in a species in its entirety may display how individuals impact the whole population as they pass their traits onto their offspring, which do the same. This lab required students to observe the individual “Skittlefish” and “Sea M&Ms” in different environments as they camouflaged and hid from predators.
The objective of the sludge lab was to determine how many different pure substances were in the sludge by using the methods and techniques we have learned throughout the year. We had to pick separation methods so we could separate our sludge and then test characteristic properties on our separated liquids and solids. This experiment made us use our knowledge on characteristic properties to pick the ones we should test to help us identify our pure substances. Characteristic properties are properties that help identify a solid or liquid. Each solid or liquid has a certain density, boiling point, solubility, flammability, so if you know what each one is then you can use that information to help you identify your solid or liquid.
The purpose of this lab was to change pennies from copper to silver to gold, like alchemists have attempted to do in history. Through the data and observations gathered throughout this experiment, it can be concluded that the pennies were not changed into a different element. For example, the density of the penny from 2005; which was the penny that was experimented on to see whether or not it could turn into silver; was 4.62 g/cm3 before the experiment and 4.89 g/cm3 by the end of the experiment. If this copper penny really would have turned into silver, then the density of the penny would be 10.49 g/cm3; which is the density of silver; by the end of the experiment. The penny may have turned silver in color, but this was only because it was plated in the zinc that was added to the beaker of water in the experiment.
Styrofoam is a lightweight and buoyant plastic that is very dangerous, it is also almost unrecyclable and it causes an enormous pollution problem, even that it is such an enormous problem it can be solved by such a tiny thing, and they’re called mealworms. Mealworms can consume 34-39 milligrams in 24 hrs without getting hurt because of a certain bacteria in their guts that allows the styrofoam to be healthy for them. Scientists hope to find mealworms aquatic equivalent so the mealworms can eat all of the styrofoam on land and in the water. Wax worms are another source of styrofoam depollution because they have the same characteristics as the mealworm and the wax worm evolves into a indian meal moths which travel faster and do the same thing.
Materials: • Preserved Earthworm • Dissection Tray • Gloves (optional) • Safety goggle (optional) • Lab Apron (optional) • Scalpel • Probe • Dissecting Pins Method: • Earthworm should be taken from a preserving chemical as it prevents the earthworm`s organs from rotting. • Lay the earthworm on a dissection tray when dissecting as it holds the earthworm`s body in to place. • Gloves, lap apron, and safety goggle protect the hands, body, and eyes from any exposure to bacteria and chemicals while dissecting. - These equipments are not mandatory but are optional when dissection. By using these equipment, you are protecting yourself from any exposure to chemicals and bacteria.
