Assorted bugs can be found in the dirt, on the land. In dirt, there are communities that can be composed of archaic, bacterial or procaryotic settlements ( Blair and Egger 2010 ) . Different bacterial settlements differ from one another based on their morphological visual aspects and form. The bacterial settlements can be assessed by their signifier, lift, border, visual aspect, optical belongings, texture and colour.

Organisms in the dirt require certain sums of O in order to last rough conditions. With O in head, the growing and endurance of the organisms depends on the location of foods in the dirt. For illustration, agricultural dirt can be either rich or deficient in foods, but this depends on where the dirt is located and how it is being taken attention of ( Blair and Egger 2010 ) . This can besides be the instance for wood dirt, nevertheless, in more to a great extent forested countries, nutrition profusion would be greater as less wooded countries lose their nutrition degree due to dirty eroding.

Not merely can dirty nutrition lead to growing of bugs, but it can assist play a function in the pH, dirt salt and temperature of the bug ( Blair and Egger 2010 ) . These factors can assist with the finding of what type of bug is present in a certain dirt type. To find what bug is present in a dirt type, trials of concentration, pH, dirt salt and temperature can be done to place a bacterium. Therefore, the intent of this survey is to be able to insulate a bacterial settlement from agricultural or forest dirt and perform trials to place the bacterium nowadays.


Agricultural and forest dirts were diluted to a 10-2 dilution and with that, dilutions of 10-3, 10-4, 10-5, 10-6 and 10-7 were created. The dirt that was isolated for our survey was agricultural dirt. The 10-2 dilution was used for culturing in a stock, a deep, a angle and a streak home base, while utilizing sterile techniques ( Blair and Egger 2010 ) . Both dirts were treated with the dilutions of 10-2 to 10-7. This was done in pour home bases, with four of them being TSA home bases ( Tryptic Soy Agar ) and the other four incorporating SDA ( Saboraud Dextrose Agar ) . The agribusiness and forest dirts in the 10-2 dilution were cultured into spread home bases, with one home base being aerophilic and the other anaerobic. These civilizations were left for a period of clip so the bacteriums could turn. From the adult bacteriums, four samples of individual bacteriums were taken. These samples were so sub-cultured onto run home bases, utilizing the technique of streaking ( Blair and Egger 2010 ) . The bacterium from the pour home bases were determined by utilizing the method of numbering ( plate numeration method for the dirt samples ) . After utilizing the numbering method, the selected bacteriums were subjected to assorted proving to see what type of bacteria was present. One method done was gram-staining and from this, the bacteria was looked under a microscope to observe morphology, cell type, form and size of the bacteria. On the sub-cultured bacteriums, proving for amylum hydrolysis was conducted. The first bacteria was tested with I for any starch hydrolysis, where the second was to look at the production of H2S in the SIM home bases ( Sulfide, Indole and Motility medium ) . Ammonification, nitrification, denitrification and nitrogen arrested development were tested on the bacteriums utilizing the reagents of diphenylamine reagents, Nessler`s reagent, sulfanilic acid, sulfuric acid, N, N-dimethyl-1-1-naphthylamine with Zn and Trommsdorf`s reagent. A trial was done for catalase by utilizing 3 % of H peroxide. A concluding set of trials done were affecting temperature, pH and osmotic force per unit area. The sub-culture for temperature was done by streaking each of the four bacteriums onto a streak home base and puting under the temperatures of 4 & A ; deg ; C, 22 & A ; deg ; C, 37 & A ; deg ; C and 50 & A ; deg ; C. The pH was tested by utilizing TSB tubings and puting the bacterium into four different pH conditions ( 3, 5, 7, and 9 ) and taking an optical density at a wavelength of 580 nanometers. By utilizing the TSA medium incorporating different per centums of NaCl concentrations ( 0 % , 0.5 % , 2 % and 5 % ) , the osmotic force per unit area was tested. From all the trials and isolations done, one bacteria was selected ( bacterium 1 ) and identified ( Blair and Egger 2010 ) .

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Table 1. Bacterial morphology for Bacterium 1


Circular, raised, filiform, glistening, opaque, xanthous in colour, smooth

Cell form and size

Circular, unit of ammunition shaped, dimensions of 1×1 ?m


Gram positive

Oxygen demands


Table 2. Biochemical trials on Bacterium 1

Starch hydrolysis


H2S decrease







Positive for NO2- but negative for NH3 or N2


Positive for NO2- but is negative for NO3-



Table 3. Environmental factors that can impact growing for Bacterium 1

Optimum temperature

22 & A ; deg ; C – 37 & A ; deg ; C

Optimal pH


Optimal osmotic force per unit area ( % NaCl )

5 %

Bacteria 1 was chosen for designation. It is a round gm positive bacteria ( Table 1 ) . From the biochemical trials completed, bacteria 1 is able to hydrolyse amylum but it has really minimum motility. The bacteria is besides able to let proteins to be broken down and organize into many aminic acids and allow ammonification to be released. Not merely that, bacteria 1 is able to oxidise ammonium hydroxide into nitrate and cut down nitrate to nitrite. It can interrupt down H peroxide as good ( Table 2 ) . The optimum environmental factors give an penetration as to what environment the bacteria grows at its best ( Table 3 ) . Enumeration was besides done to see how much of the bacteria was present, based on each status in the tabular arraies above. By numbering, it was determined that the bacteria was present in big Numberss, largely in the pour home bases.


From all the trials completed and the consequences seen, bacterium 1 can be identified as it is a gram positive coccus bacteria. This and the bacterial morphology can assist find what genus the bacteria could belong to. The type of O demands for the bacteria can besides assist place the individuality. The bacteria is microaerophile, which is specific type of micro-organism that requires oxygen to last, but requires environments incorporating lower degrees of O than are present in the ambiance ( Be’er et al. 2009 ) . With all of these premises, a genus can be determined, including the bacterial morphology and the catalase production degrees.

From all the consequences, the genus of the bacteria could be Staphylococcus, as it is more apparent in H2O and dirt conditions ( Bergey and Holt 1986 ) . This genus is able to organize in braces and in irregular bunchs. The settlements are besides a pale orange in colour, as seen in the survey. Staphylococcus is able to digest a concentration of 5 % NaCl, with a handbill, smooth and spherical morphology. Nitrate is besides able to be reduced into nitrite in this genus ( Bergey and Holt 1986 ) .

Based on consequences for the hydrolysis of amylum, H2S decrease and osmotic force per unit area, a species can be narrowed in the genus of Staphylococcus. Even though all the consequences do non fit a specific species, the bacteria is closest to the species S. Hyicus ssp. hyicus. It seems that this species is closest to the bacteria as it is spherical, with dimensions of 0.8×1.1 ?m and is able to defy concentration of 10 % NaCl and a pH of 4.8-5.3, with the best temperature growing at 37 & A ; deg ; C. It is able to cut down nitrate to nitrite and it is able to bring forth ammonium hydroxide from arginine ( Bergey and Holt 1986 ) . From the consequences, the optimum pH is 7, but the pH for S. Hyicus is between 4.8-5.3. This could be a consequence of the survey being done in a controlled environment, and non in a forested country. With the consequences saying that nitrates can non be able to cut down lower than a nitrite, but S. Hyicus can, this could be due to the fact that the bacteria chosen was non able to be to the full incubated on the run home base, taking it to be unable to cut down nitrite farther down ( Kenyatta et al. 2003 ) .

The genus and species can be largely found in H2O and dirt home grounds, but it can besides be found in worlds and hog. However, S. Hyicus does non do serious harm or injury to a human being. Since the sample isolated was the agricultural dirt, and the species determined is S. Hyicus, the species is rather rich in foods and it can assist in the growing procedure of trees and workss as N is present in it.

Another manner to perchance place a bacteria is to insulate Deoxyribonucleic acid from a dirt sample and compare it to the Deoxyribonucleic acid from other generations ‘ . Another method is to prove for specific antigen antibody reactions, which is an illustration of serological trials ( Ohba and Aizawa 1978 ) . Since bacteriums can function as antigens, production of antibodies in a mammal and testing of antiserum can be done by agglutination proving. In this trial, a bead of a bacteria is put onto a slide with the anti-serum of an septic mammal and looked at by the usage of a microscope. If cloping happens, the bacteria is considered to be either the same or related to the bacteria used as the antigen ( Ohba and Aizawa 1978 ) .

A beginning of possible mistake that could hold occurred in the continuance of this survey could hold been that there was some kind of cross taint that occurred during the incubation or sub-culturing procedure. The right technique of sterile vaccinating could hold non been done decently, therefore taint could hold resulted. Besides, there could hold been mis-labelling that occurred as the top of the home bases used in the survey were labelled alternatively of the underside. This can ensue in the palpebra of a home base being put onto another home base that does non incorporate the specific bacteria as the label describes, therefore taking to varied consequences.

With the isolation of a dirt sample and assorted trials that have been done in order to find what genus and species the sample could belong, it was found that the genus could most perchance be that of Staphylococcus. In this genus, the species could be, as the consequences are rather near to the features of S. Hyicus. By being able to find the genus and species, the survey was a success.


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