Category : Biology

Determining Evolutionary and Environmental Influence on Photosynthetic Pigment Composition in Eukaryotic Photosynthetic Organisms

Written by Aida Martinez Introduction All organisms require a metabolic process that allows them to convert something they intake into energy. To convert light into energy, all organisms contain tetrapyrroles (involved in energy transfer, catalysis and transduction) (Reinbothe 1995). Of the greatest sources of energy is photosynthesis. Photosynthesis is a metabolic process (present in photosynthetic organisms) that intakes light, carbon dioxide, minerals, and water to produce chemical energy such as sugars, ATP and oxygen. Sugars and ATP are stored in […]

Transmission of Microorganisms on Skin and Fomites

Written by Corinne Introduction             Microorganisms can be transmitted from infected to healthy persons in a variety of ways. Two ways emphasized in this lab report are transmission via skin to skin contact, and transmission via fomites. Fomites are objects or substances which are not living but capable of transmitting microorganisms between people. Fomites become especially dangerous in hospitals or other healthcare facilities, as they can transmit nosocomial infections. Nosocomial infections are acquired by patients while in a hospital setting, […]

Male gametophyte growth as a factor of initial spore density among C-fern sporophytes

Written by Miranda ABSTRACT: C-fern spores have the ability of exhibiting both male and hermaphroditic sexes. Hermaphroditic gametophytes are always developed first, and if they release enough of the pheromone antheridiogen, male gametophytes will develop. Higher spore densities should show evidence of higher male populations. The gametophyte development can be observed under dissecting microscopes. Population densities were calculated each week for three weeks and based off of data collected, male population was slightly higher in higher density environments, but further […]

The Effects of Temperature, pH and Enzyme Concentration on Amylase

Written by Sarah Introduction Enzymes are proteins that are critical to catalyzing reactions (Brooker, Widmaier, Graham & Stiling, 2011). Like most proteins, they are synthesized by the ribosomes in the cell. They react with a specific substrate in order to increase the rate of a chemical reaction within the cell. Without enzymes, reactions would be significantly slower and we would not be able to do the most basic functions, such as breathing or digesting food. Amylase is an type of […]

Light-induced Proton Transport through Thylakoid Membranes in Chloroplasts

Written by Nicolas The proton uptake of thylakoid membranes during photosynthesis was analyzed through measuring pH. As light reaches the plant, the chlorophyll begins to absorb and release excited electrons. As the electrons pass through the Quinone they increase the Proton concentration on one side of the thylakoid membrane. This then drives the ATP synthase to form ATP from ADP by means of channeling the protons to turn the synthase. The net process is described by scheme 1 below, taken […]

Comparing the Influence of Caffeine on the Metabolism of Goldfish (Carassius Auratus Auratus)

Written by Aida Introduction Metabolism has been a topic of interest for all living organisms. Many factors can affect the rate of a living being’s metabolism. Both ectotherms and endotherms differ in the way they control their temperature and so how they manipulate their metabolism. It is particularily interesting how poikilothermic organisms are affected by their surrounding environment. Indeed, Dr. Richard P. Brown investigated that body size has minimal direct influence on body-air temperature difference in ectoderms. Additionally, he discusses […]