solution has no effect on this bacterium besides a slight drying effect on the wall, The pink counterstain does bind the cells but it is not seen because covered by a darker purple colour primary stain. Bacillus subtilis are Gram-positive rod shaped bacteria that appear as small chains or single cells. They have thick peptidoglycan layer that can retain the purple stain from crystal violet. Saccharomyces cerevisiae are circular which occur singly or in a group. They do not respond to gram staining due
Words: 945 - Pages: 4
microbial media are really best for growing microorganisms. They provide the right nutrients that allow good growth. However, if a commercial agar medium is too expensive, you can prepare homemade gelatin plates that will allow many fungi and some bacteria to grow. This homemade medium can be poured into sterile disposable petri plates or, if those are too expensive, can be poured into foil muffin cup liners that can be stored in plastic sandwich bags. Materials • plain gelatin • water • sugar
Words: 281 - Pages: 2
Experiment 4: Isolation of Individual Colonies For the experiment, isolation of individual colonies I was allowed to compare enriched, complex, and synthetic media. Enriched media contains some important growth factors necessary for growth of specific organisms or an organism that has a complex nutritional requirement. This "growth factor" contains vitamins, amino acids, blood components, or carbon sources. Enriched media is used to harvest as many different types of microbes as are present in a
Words: 821 - Pages: 4
Gerald McDonnell 1. The major differences between prokaryotes and eukaryotes are as follows; prokaryotes are much smaller than eukaryotes, prokaryotes have a nucleoid instead of a nucleus (which eukaryotic cells have), prokaryotes lack a membrane bound organelles while eukaryotes have them, prokaryotes are bacterial cells while eukaryotes can be considered the building blocks of plant and animal life. 2. A. A nucleus is basically the “brain” of a cell. It controls reproduction and contains the genetic
Words: 985 - Pages: 4
Aseptic packaging or processing is where a food product, such as ultra-high temperature (UHT) milk) and its package is sterilized separately and then combined and sealed under sterilized atmosphere. The first practice of this was in Denmark in 1913 packing milk in metal cans. In 1921 a patent was granted for the process under the term aseptic conservation. In 1923 aseptically packaged milk from South Africa was shipped to London to a trade fair and it arrived in perfect condition. In 1933 a filling
Words: 919 - Pages: 4
1. Introduction: Chitosan is a natural biodegradable polymer composed of 2-amino-2-deoxy-β-D-glucose (D-glucosamine) with β (1-4) linkage, and with occasional N-acetyl glucosamine residues (Austin et al., 1981). This is a biopolymer that is consistently playing an important role in the world’s economy since it is biocompatible, biodegradable, edible, and antimicrobial (Muzzarelli & Muzzarelli, 2005). As compared with other bio-based food packaging materials, chitosan has antibacterial activity by
Words: 2144 - Pages: 9
Dermato-venerologie Curs I Semne si simptome prezente in dermatologie Notiuni generale Pielea este un invelis conjunctivo-epitelial, care se continua cu semimucoasele si mucoasele cavitatilor naturale. Are o suprafata medie de 1,5-1,8 m patrati si reprezinta aproximagtiv 1/15 din greutatea corpului. Structura pielii: pielea este alcatuita din epiderm, derm si hypoderm (tesut celular subcutanat – paniculul adipos) Epidermul este stratul extern al pielii, este format din epiteliu pavimentos
Words: 702 - Pages: 3
Gmo’s have been used to modify our food so that they can resist pests and temperature changes, along with other various inhabitants. They have become a controversy with the unconventional practice of splicing animal and insect genes into our food in order to give it traits that not only help with yield but weather changes and lack of soil integrity. With the technological advances in saving and improving the food we need to eat, I think we need to take advantage of what is available to us and find
Words: 801 - Pages: 4
Keywords: HPTLC, Tetracyclines, residues and broiler meat, validation Introduction Tetracycline antibiotics (TCs) which are represented by oxytetracycline (OTC) and tetracycline (TC), are active against gram positive and negative bacteria antimicrobials and are commonly used in livestock and poultry for prevention and treatment of various diseases [1]. Chemical names for these antibiotics are 4-(Dimethylamino)-1,4,4a,5,5a,6,11,12a-octahydro3,5,6,10,12,12a-hexahydroxy-6-methyl-1,11-dioxo-2-naphthacenecarboxamide
Words: 2833 - Pages: 12
An invasive species is a plant, animal, or microorganism that is not native to the environment. Just one invasive species in Ohio is the, Japanese Honeysuckle - Lonicera japonica. The Japanese honeysuckle is a semi-evergreen vine that can climb up to 10m and drapes creating dense patches. It has white - yellow flowers that grows in pairs. The flowers are very fragrant, with a sweet fruity smell. This plant is from Eastern Asia, including Japan and Korea. The damage is causes is the vines can wrap
Words: 300 - Pages: 2
