5/22/2019

Do Human Pheromones Improve Your Sexual Attraction? 

Human pheromones are natural chemicals produced by the body that are thought to cause the attraction between opposite sexes. While it is believed that there is some connection, the real analysis lies in how much do human pheromones and sexual attraction depend on each other.


QUORUM SENSING EXPERIMENT NUMBER 1 In this present study, the producer and inducer strains were cross reacted to find out the production of antibiotic compound through quorum sensing. Totally three set of cultures were maintained as follows (along with one as control).
 




Writing about how to naturally produce pheromones is an interesting writing assignment. There is no end to it, as there is so much to write about it!

Trischman, J.A., D.M.Tapiolas, P.R.Jensen, R.Dwight, W.Fenical, T.C.Mckee, C.M.Ireland, T.J.Stout, J.CIarely. 1994. Salinamide - A and salinamide - B - anti -inflammatory depsipeptides from a marine streptomycete. J.Am.Chem.Soc. 116: 757 -758.

Bassler, B. L., E. P. Greenberg, and A. M. Sterens. 1997. Cross species induction of luminescence in the quorum - sensing bacterium Vibrio harveyi. J. Bacteriology. 179: 4043-4045.

If you had three wishes, what would they be? If you were an animal, what would you be? If you had only six months to live, what would you do first?

In gram positive bacteria peptide and derivative peptide based signaling molecules seem to be the predominant mode of communication. During high cell density the marine bacteria can produce enzymes, surfactants, toxins, and antibiotics by the chemical signal communication. Marine epibiotic bacteria are also known to produce compounds active against drug resistant hospital pathogen by the cross species induction method. Building on assays described by Austin (Billaud and Austin 1990) a screening procedure has been developed in which marine bacteria are challenged by exposing them to terrestrial bacteria prior to assay of antimicrobial compounds. Hence in this present investigation it is proposed to find out the ability of sea weed epibiotic bacterial organism to produce antibacterial compounds through quorum sensing.

Vijaya baskar .P 1* AND Veera ravi.A 2 1. Department of biotechnology Dr. G.R.D.C.S, Coimbatore. 2. Department of biotechnology, Alagappa University, karaikudi.

illaud, A. C, and B. Austin. 1990. Inhibition of the fish pathogen, Serratia liquefaciens by an antibiotic producing isolates of planococcus recovered from sea water. Journal of

Starch hydrolysis test, Protein hydrolysis test, Lipid hydrolysis test, Oxidative / Fermentative test, Salt concentration (0%, 3%, 5%, 7%, 10%), TCBS, Growth in Temperature, 42??C and 47??C

MATERIALS AND METHODS: SAMPLE COLLECTION: Seaweed samples were collected from Gulf of Mannar Marine Biosphere Reserve and identified up to species level by using CMFRI bulletin (14) as follows:

c) The normal 20 bacterial strains isolated from 20 algal species were crossed with terrestrial bacteria such as E-coli, Staphylococcus aureus separately

Liming, Y., G. K. Boyd, and J. G. Burgess. 2002. Surface induced attachment induced production of Antimicrobial compounds by marine epibiotic Bacteria using modified Roller Bottle. Mar. Biotechnology. 4: 356 - 366.

All the 17 strains were named as PRODUCERS STAINS BrA+, BrB+, BrC+, BrD+, BrE+, BrF+ Hypnea musiformis GcA+, GcB+, GcC+, GcD+, GcE+, GcF+ Gracillaria edulis

All the cultures were incubated at 28??C for 5 days. After the incubation period the cultures were centrifuged at 10,000 rpm for 15mins. The supernatant was collected and subjected to antibacterial assay with respective inducer strain.

GcA-, GcB-, GcC-, GcD- GcE-, GcF- Gracillaria edulis U1-, U2-, U3-, U4- Ulva lactuca SA- Sediment

U1+, U2+, U3+, U4+ Ulva lactuca SA+ Sediment INDUCER STRAIN BrA-, BrB-, BrC-, BrD-, BrE-, BrF- Hypnea musiformis

b) Among these 17-inducer strain 6 strains were isolated from Hypnea musiformis, 6 from Gracillaria edulis, 4 from Ulva lactuca & 1 from sediment.

Kell, D. B., A. S. Kaprelyants, and A. Grafen. 1995. Pheromones, Social behaviour and the functions of secondary metabolism in bacteria. Trends in Ecol. and Evol. 10: 126-129.

Holmstrom, C, D. Rittschof, and S. Kjelleberg. 1992. Inhibition of settlement by larvae of Balanus amphitrite by a surface - colonizing marine bacterium. Appl. Env. Microbiol. 58: 2111 -2115.

Evelyn, A., Y. Liming, K.G. Boyd, P. C. Wright, and J. G. Burgess. 2001. The symbiotic role of marine microbes on living surfaces. Hydrobiologia. 461: 37 - 40

Boyd, K.G., A. Mearns -Soragg, G. Briedley, K. Hatzidimitriou, A. Rennie, M. Bregu, M. 0. Hubble, and J. G. Burgess. 1998. Antifouling potential of epiphytic marine bacteria from the surface of marine algae. Plouzane, France: 128 -136.

Scientists have determined a marked difference in the pheromones between males and females. It has also been looked at as to why there are different pheromones for each gender.

Microdictyon tenunis Chlorophyceae Chondrococcus hornemonii Chlorophyceae Enteromorpha intestinalis Chlorophyceae Caulerpa cupressoides Chlorophyceae

We suggest that the above said mechanisms in Pseudomonas with quorum sensing principle might have occurred in the present study also. This induces the bacteria Pseudomonas in epibiotic seaweeds to secrete certain active compound against to the competitor Vibrio species.

Miller, M. B., and B. L. Bassler. 2001. Quorum sensing in bacteria. Annu. Rev. Microbiol. 55: 165-199. Msadek, T. 1999. When the going gets tough: survival strategies and environmental signaling network in Bacillus subtilis. Trends Microbiol. 7: 201-207.

A. Live cells of producer and inducer strains B. Live cells of producer strain alone C. Live cells of inducer strain alone In culture system A 200ul of 16 hours old broth culture of both producer and inducer strains were added to the 15 ml of nutrient broth.

REFERENCES Alim, I., and K. Yuto. 2003. Mc21-A, a Bacteriocidal antibiotic produced by a new marine bacterium, Pseudoalteromonas phenotica sp. nov. O-Bc 30T, against Methicillin -Resistant Staphylococcus aureus. Antimicro. Agents Chemoth. 47: 480 - 488.

Br B+ /Br B- Br C+/Br C- Br D+/Br D- Br E+/Br E- Br F+/Br F- BrA- Br B- BrC- BrD- BrE- BrF- NIL 39

GcD- GcE- GcF- NIL NIL 26 NIL NIL NIL Ulva lactuca 13. U1+ 14: U2+ 15. U3+ 16. U4+ U1-

Makers of synthetic human pheromones believe that they are very important in sexual attraction. In fact, these manufacturers sell these synthetic pheromones on the basis that they will help a person attract someone of the opposite sex. These synthetic hormones are used as a perfume or added to a perfume.

In the present investigation, it was aimed to produce the antibiotics from the seaweed epibionts through quorum sensing principle. The bacterial isolates of seaweed epibionts were identified as species of Pseudomonas and Vibrio from seaweeds Hypnea musiformis and Gracillaria edulis. In this study the Pseudomonas acts as a producer strain and Vibrio as inducer strain. The recent finding says that the seaweed epibionts having potential to control the metabolic activity of competitor organisms. Allison et al., 1998 reported that many bacterial strains up on attaching to a surface produce exopolysaccharides or exopolypeptides. In addition, it has been postulated that exopolysaccharides could mediate the attachment of the bacteria to the surface and induce metabolic changes.

Burgess, J. G., H. Miyashita, H. Sudo, and T. Matsunaga.1991. Antibiotic production by marine photosynthetic bacterium Chromatium purpuratum NKPB 031704: Localization of activity to the chromatophores. FEMS Microbiol. Lett. 84: 301 - 306.

What words would your friends use to describe you? It's not a good idea to ask your prospective date where she or he lives until you know them a little better. If possible avoid sensitive areas such as religion or politics. Remember to maintain eye contact during the conversation. Also, don't turn the conversation into an interrogation.

Ines, M. M., B. Karaigher, U. Cepon, and I. Mahne. 2003. Variability of the Quorum sensing system in natural isolates of Bacillus sp., Food technol. Biotechnol. 41: 23 - 28.

Hiroaki, S., and K. M. Smith. 2003. Molecular mechanisms of bacterial quorum sensing as a new drug target. Curr. Opin. Chem. Biol. 7: 586-591. Hoang, T., Y. Ma, R. J. Stern, M. R. Meneil, and H. P. Schwezer. 1999. Construction and use of low-copy number T7 expression vectors for purification of problem proteins: purification of Mycobacterium tuberculosis RmID and Pseudomonas aeruginosa Lasl and Rhll proteins, and functional analysis of purified Rhll. Gene. 237: 361 - 371.

*Corresponding author e-mail: vijay10bas@yahoo.co.in INTRODUCTION We are living in a microbial planet. About 71 % of the surface of this planet is covered by sea water. A typical milliliter of seawater contains 103 fungal cells, 106 bacteria, and 107 viruses, including pathogens that cause widespread mortalities and microbes that initiate fouling of host surfaces (Rheinheimer, 1992). Thus, marine plants and animals are continually exposed to high concentrations of potentially harmful microbes. These microorganisms in nature exists as free living planktonic mode of life in sea water or it may exist as epibiotic organisms in various living and nonliving surfaces. Among living organisms, seaweeds and invertebrates act as suitable substrate for the establishment of epibiotic organisms Seaweeds are known to release a large amount of organic carbon into the surrounding environment providing a nutrient rich habitat for microorganisms like bacteria. Bacteria are generally considered to be independent unicellular organisms. One cell accomplishes all of the tasks of feeding, locomotion, 'reproduction, respiration and all other processes necessary to keep an organism alive. There are several classes of bacteria such as primary film forming bacteria, sediment bacteria, symbiotic bacteria, and epibiotic bacteria in various aquatic organisms. The marine surface environment is a site of intense composition for living space by a wide variety of organisms. Bacteria are generally recognized as primary colonizers of this habitat and are able to form biofilm on marine surface such as invertebrates and algae (Bryers, et al., 1982). Bacteria may also be abundant on the surfaces of some algae as an important epibiotic organism. In many cases, the bacterial population found to be specific, with changes occurring throughout the year or life span of the algal surface. This algal-bacterial relationship is symbiotic in most cases; the epibiotic bacteria in seaweed play a protective role by releasing secondary metabolites into the surrounding seawater that help preventing extensive fouling of the surface. Epibiotic bacteria are therefore attracting attention as a source of new natural products. Bacteria from the larvae of some crustaceans protect them from fungal infection by the production of simple antimicrobial compounds. Bacteria isolated from the surface of a tunicate prevented the settlement of barnacle and tunicate larvae exposed to the bacteria as biofilm in petridishes (Evelyn et al., 2001).

Writing about how to naturally produce pheromones is an interesting writing assignment. There is no end to it, as there is so much to write about it!



Icebreaker Pheromone Cologne



Dictyota batryensis Phaeophyceae Sargassum sps Phaeophyceae Hypnea musciformis Rhodophyceae Acanthophora dendroides Rhodophyceae Jania rubens Rhodophyceae

In culture system B 200ul of 16 hours old producer strain alone was inoculated. In culture system C 200ul of 16 hours old inducer strain alone was inoculated.

The results of Vanderivere and Kirchman 1993 suggest that the addition of increased surface by adding sand will induce the exopolymer synthesis through the high cell density dependent system. In the same way the bacterial organisms attached to the surface of seaweed shows alteration of genes expression may be due to the response to the high competitive environment. When cell density increases the competition for space and nutrients are also increased. So the existing bacteria were forced to protect themselves in this competitive environment. Normally in this condition the bacteria will be activated to induce the expression of certain hidden genes in genetic material through quorum sensing. The quorum sensing is principles were active compounds (autoinducer) from bacterial cell will promote the expression of a particular hidden gene of other bacterial organism in a stressed condition.

Technically, pheromones in humans are linked to the reproductive process and the attraction between men and women. According to studies, the effects of pheromones in humans can be largely detected in the relationship between the mother and child. Studies have shown that infants usually display instinctive attachments to their mothers through the smell, texture and sounds that can be associated with the mother especially when she is nursing.

The earlier genetic analysis in Pseudomonas reveals the Pseudomonas consist of two quorum sensing systems as Las R1-I and Rh1R-l and have linked with R and I genes, in addition recently a third Lux R homolog that is advanced to a cluster of quorum sensing - controlled (qsc) genes were detected. Las R is a transcriptional regulator that responses primarily to the Las I - generated signal and Rh1R is a transcriptional regularly that responses best to the Rhl -generated signal. In Pseudomonas auriginosa, at low population densities Las I produce a basel level of 3-O-C12-HSL. As density increases, 3-0-C12-HSL builds to a critical concentration, at which point interacts with LasR. This Las R -3-0-012-HSL complex that activates transcription of a number of genes [Whileley, et al., 1999].

Rheinheimer, G.1992.Aquatic microbiology (Wiley, New York), 3rd Ed. Stead, P., B. A. M. Rudd, H. Bradshaw, D. Nobel, and M. J. Dawson. 1996. Induction of phenazine biosynthesis in cultures Pseudomonas aeruginosa by L-N-(3-oxohexanoyl) homoserine lactone. FEMS Microbiology Letters 140: 15-22.

In the gram negative bacteria AHSL is an active principle of quorum sensing. Our producer strain is also been identified as Pseudomonas sps. So in these organisms also active principle must falls under the AHSL. The cell-cell signaling mechanism can either require import of the signal and subsequent interaction with intracellular effectors or a two-component signaling system that transducers the information across the membrane. In V. harveyi genetic analysis of the density sensing apparatus has two independent density-sensing systems, and each is composed of a sensor-auto inducer pair; system one is composed of sensor I and Al -1, and system two is composed of sensor 2 and AI-2. The two densities - sensing system are redundant, because a null mutation in either system alone results in expression of hidden genes (Bassler, et al.,1999.).

Yotsu, T., Y.Meguro, A. Endo, M. Murate, H. Naold, and T. Yasumoto.1987. Production of tetrodotoxin and its derivatives by Pseudomonas sp. Toxicon 25: 225 - 228

Korber, D. R., J. R.Lawrence, H. M. Lappin-scott, and J. W. Costerton. 1995. Growth of microorganisms on surfaces. In. Microbial. Biofilm, Lapp in - Scott. Cambridge, UK: Cambridge university press.

Caulerpa racemosa Chlorophyceae Dictyota dichotoma Phaeophyceae Turbinaria ornata Phaeophyceae Padina gymnospora Phaeophyceae Sargassum cinearifolium Phaeophyceae

So, you've decided to try speed dating, but you have no idea what you are going to ask your speed dates? Here are some speed dating questions that will help you get the information you want out of potential long-term partners:

All the above mentioned biochemical tests were performed by following standard methodology given in the Microbiological Laboratory Manual by James 3.Cappuccino (1999).

TEST ORGANISMS: 1. Epiphytic Vibrio from seaweeds 2. Vibrio from primary film 3. Vibrio from Sediments 4. Pathogenic bacteria such as Escherichia coli, Staphylococcus aureus, Salmonella sp. and Proteus sp

BACTERIAL IDENTIFICATION The organisms responded to the quorum sensing process alone were identified by the following biochemical analysis.

It is all a matter of personal experience, really, because science still seems to be at odds with itself over conclusive proof. The most important thing is if you can prove it to yourself that there is a link between human pheromones and sexual attraction.

What are you looking for in a relationship? What you don't want in a relationship? Which is the one job in the world that you would really like to do?

Burgess, J. G., E. M. Jordan, M. Bregu, and A. Mearns-spragg. 1999. Microbial antagonism: a neglected avenue of natural products research. J. Biotechnology. 70: 27-32.

Patterson, G. L., and C. Ml. Bolis. 1997. Fungal cell - wall poly sacchraides elicit an antifungal secondary metabolite in the Cyanobacterium Scytonema ocellatum. J. Phycology. 33: 54 - 60.

Allison, D. G., B. Ruiz, C. Sanjose, A. Jaspe, and P.Gilbert. 1998. Extracellular products as mediators of the formation and detachment of Pseudomonas fluorescens biofilms. FEMS Microbial Lett. 167: 179-184.

In this present work the totally 54 isolates were screened from 20 different seaweed species out of which 34 species were showed the signs of quorum sensing i.e. 17 producer and 17 inducer strains, but when these organisms where subjected to quorum sensing principle in mixed culture only 3 them have responded. So the present study reveals around 17% of bacterial species isolated from seaweeds and sediment were responded to quorum sensing. According to the results of bacteria isolated from marine algae surfaces indicated that the incidence of antibiotic producing strains from this habitat was 20% where as that from sea water was only a few percent. In the present study also reveals more or less the same ratio in Pseudomonas spp. was observed. Our results also reveals a results of Kell et al., 1995; Stead et al., 1996; they have said the culture supernatant of Pseudomonas sps known to contain AHLS which induces the production of phenazine antibiotics. In this investigation due to time constraint, It was not attempted to identify the active compound secreted by Pseudomonas through quorum sensing, which may leave the space for the further intensive research in future.

Satisfied and repeat customers are usually a good indication whether there is substance behind claims, and in this case it would seem to prove that human pheromones and sexual attraction are linked. Many customers buy again and again and will testify that the pheromones work.

RESULTS AND DISCUSSION: QUORUM SENSING/CROSS SPECIES INDUCTION ANALYSIS In the present investigation totally 54 isolates were collected out of seaweed species. Among 54 isolates, 17 of them are producer strain, another 17 are the inducer strain rest of 20 isolates is normal and not showing any signs of activity (Table.2).

Mckenney, D., K. E. Brown, and D. G. Allison. 1995. Influence of Pseudomonas aeruginosa exoproducts on virulence factor production in Burkholderia cepacia: evidence of interspecies communication. J. Bacterial 177: 6989 - 6992.

Burgess, J. G., M. Elizabeth, M. Bregu, A. Meams-Sprugg, and K. G. Boyd. 1999 Microbial antagonism: a neglected avenue of natural products research. J. Biotechnology. 70. 27-32.

CONCLUSION: The present investigation was aimed to study the quorum sensing principle among seaweed epibiotic bacterial organisms. In the past few decades there was no findings of new novel antibacterial class compounds were identified. But, the pathogenic microorganisms show much higher rate of resistant development even to the potential antibiotics. So, there is an urgent need to discover new novel antibiotic compounds. The marine inhabitants such as microorganisms, seaweeds, invertebrates, etc., act as an undepleted source of wide range of natural products among which the seaweeds act as a potential source of antibiotic compounds. Currently the cross species induction / quorum sensing attracts the total attention of researchers in finding new novel drugs against multidrug resistant pathogenic microorganisms. So, the present study aim to find out the capability of seaweed epibiotic bacterial organisms to produce novel drugs against the animal and plant pathogens


It is important that you trust your gut instinct. Asking the right questions combined with your intuition will definitely help you find the man or woman of your dreams.



Never before have I written such an informative article on how to naturally produce pheromones. Hope you felt the same about it too!
Author Dave Thomson
 
 
 


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