Learn More About Pheromones In Humans 

The discovery of pheromones in 1959 led to several developments in the areas of relationships and behaviors. Pheromones were originally associated with the chemical substances that animals usually excrete to send a message to their own species. Further research on the topic widened the definition of the word pheromones to include other species such as human beings. In fact, pheromones in humans became one of the favorite subjects of researchers all over the world.

Self-praise is no praise. So we don't want to praise ourselves on the effort put in writing on pheromones in humans. instead, we would like to hear your praise after reading it!

In concluding this discussion, the quorum sensing is wider spread among bacterial population then was previously thought, (In Gram positive, Gram negative bacterial communication). Current assays for antimicrobial activities are inadequate because some antibiotic producing bacteria may require the presence of another bacterial species. These findings have important implication for the discovery of novel antimicrobial compounds from marine bacteria and may allow the development of new methods for screening novel compounds active against multidrug resistant bacteria.

The test organisms Vibrio species were isolated from seaweed as epiphyles, biofilm, sediment and puffer fish by using TCBS medium (Hi media) The pathogenic bacteria were collected from clinical laboratories.

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

Do pheromones in humans really work like the pheromones in insects and animals? A number of scientists would like to believe that they do. However, there are also many who vigorously object to such a conclusion because if we equate pheromones in human beings with that of other species, this could mean that like animals, humans could be made to falsely respond to certain synthetic forms of pheromones.

Table 1. List of Seaweeds species collected for the present study SPECIES NAME FAMILY Halimeda gracilis Chlorophyceae Ulva lactuca Chlorophyceae

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

Bryers, J. D., and W. G. Characklis. 1982. Processes governing primary biofilm formation. Bioeng. 24: 2451-2476 Burgess, J. G., K. Boyd, E. Armstrong, T. Pisacane, and D. R. Adams. 2003. The development of a marine natural product-based antifouling paint. Biofouling. 19: 197 -205.

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.

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.

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).

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.

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

Seaweeds itself secretes secondary metabolites to prevent fouling and grazing. In addition to that epibiotic bacteria on macro algae can also produce antifouling compounds that work in concert with the seaweed derived compounds to protect the seaweed surface. Recent studies have highlighted important roles of epibiotic bacteria colonizing the surface of seaweeds and releasing antifouling compounds. For the past 50 years antibiotics have revolutionized medicine by providing cures for formerly life threatening diseases. However, strains of bacteria have recently emerged that are virtually unresponsive to antibiotics such multidrug resistance, arising mainly through antibiotic misuse, is now recognized as a global health problem. In this situation, it is clear that new classes of antibiotics are urgently needed. Many marine bacteria have been shown to produce secondary metabolites that display antibacterial properties. The first antibiotic from a marine bacterium was identified and characterized in 1966. In addition, bacteria in biofilm on the surface of marine organisms have been documented to contain a higher proportion of antibiotic producing bacteria than some other marine environments (Burgess, et al., 1999). Marine epibiotic bacteria, associated with nutrient-rich algal surfaces have also been shown to produce antibacterial secondary metabolites which inhibit the settlement of potential competitors. Recently a lot new novel antibiotics such as Phenazine, thiomarinol, phenazine-1-carboxylic acid, 1-hydroxyphenazine 2-n-heptylquinol-4-one, 2-n-nonylquinol-4-one pyolipic, loloatins, agrochelin, sesbanimides, pelagiomicins, indomycione and indomycione have been identified from various marine epibiotic bacterial organisms. In particular, some species of the genus Pseudomonas produce both antibiotics and several other bioactive substances. For example, Pseudoalteromonas rubra and Pseudoalteromonas aurantia have been reported to be antibiotic producing bacteria. The phenomenon of higher organisms utilizing their associated microflora for the production of beneficial secondary metabolites is common in the marine environment (Yotsu, et al., 1987). A study of bacteria isolated from marine algae surfaces indicated that the incidence of antibiotic producing strains from this habitat was 20% whereas that from sea water was only a few percent. In addition, some bacteria that previously did not produce any active compounds have been found to be producing such metabolites when they are exposed to other bacterial species or extra cellular chemical from other bacteria. Bacteria may also produce antimicrobial compounds when they sense the presence of competing organisms. However, few attempts have been made to study such chemical communication between different bacterial species or how this might affect. The secretion of antimicrobial compounds (Mearns-Spragg, et al., 1998). Bacterial communication by the chemical signals for specific function is simply known as Quorum sensing. In which a bacterial population receives input from the environment and elicits an appropriate response (Hiroaki and Kristina. 2003). The term "quorum sensing" describes the ability of a microorganism to perceive and response to diffusible signal molecules. Bacterial cells sense their population density through a sophisticated cell to cell communication system and trigger expression of particular genes. Tne first system of density-dependent regulation was studied in detail with the luminescence of Photobacterium fischeri (formerly known as Vibrio fischeri) by Bassler et al., 1997. Eventually, they discovered that 3-oxo-N-(tetrahydro-2-oxo-3-furanyl) hexanamid or N-3-(oxohexanoyl) homoserine lactone (OHHL) was responsible the agent in the broth that induced luminescence. Followed by this many researchers have confirmed that in Gram negative bacteria acyl-homoserine lactone is responsible for the cell to cell communication system.

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.

*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).

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.

Androstenol, which appears in fresh sweat, is disintegrated by bacteria in about 15 to 20 minutes. This pheromone, which reported by women to be sweet-smelling, is also called the "pillow-talk pheromone", because women are exposed to it immediately after love making during the cuddling phase.

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.

Self-praise is no praise. So we don't want to praise ourselves on the effort put in writing on pheromones in humans. instead, we would like to hear your praise after reading it!

Icebreaker Pheromone Cologne

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].

EXPERIMENT NUMBER 2 In this experiment, culture supernatant was obtained as per the procedure given in the experiment 1. 50ml of supernatant was mixed with equal volume of 80% methanol and 1% acetic acid mixture and it was shaked thoroughly in a separating funnel. Finally the methanol and acetic acid fractions were collected and concentrated by evaporation using water bath at 55??C. The viscous colloidal residues were resuspended in 600 microlitre of 50% methanol and it was used for antibacterial assay against different test organism.

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.

Androstenone pheromone is not the same as androstenol. Androstenol is produced by fresh male sweat, and is relatively attractive to women. The other pheromone, androstenone is produced by male sweat, when that sweat becomes less fresh - after exposure to oxygen. Androstenone is highly unpleasant to women, except during ovulation, when female response to this pheromone changes to "neutral". Therefore, the sweaty macho-man is likely to be unattractive to most women.

Like in the case of animals and insects where the young often pick up messages through the pheromones left by their mothers, infants display distinctive characteristics of recognition. Such recognition led scientists to believe that pheromones in humans also function much like the pheromones in other species although in a less pronounced manner.

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.

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

Meains - Spragg, A., M. Bregu, K. G. Boyd, and J. G. Burgess. 1998. Cross species induction and enhancement of antimicrobial activity produced by epibiotic bacteria from marine algae and invertebrates, after exposure to terrestrial bacteria. Letters in Applied Microbiology. 27: 142-146.

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

Whiteley, M., K.M.Lee, and E.P.Greenberg.1999. Identification of genes controlled by quorum sensing in Pseudomonas aeruginosa. Proc.Natl.Acad.Sci.USA.96:13904-13909.

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.

Colony morphology, Gram staining, Motility test, Oxidase test, Catalase test, Indole Production, Methyl red test, Voges Proskauer test, Citrate Utilization test, Triple sugar Iron test, Nitrate reduction test, Lactose fermentation, Urease test

Hypnea musiformis 1. BrA+ 2. BrB+ 3. BrC+ 4. BrD+ 5. BrE+ 6. BrF+ BrA- BrB- BrC- BrD- BrE- BrF- Br A+ /Br A-

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.

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

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

Aside from the studies conducted on the relationships between mother and child, there have been studies conducted regarding the effects of pheromones in humans when it comes to attracting the opposite sex. Although there has been much criticism regarding this matter and how it was not acceptable to some people that attraction between a male and female human being could be reduced to a simple interplay between the pheromones in humans, several scientists have made some discoveries in this area.

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.

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.

NIL NIL NIL NIL Gracillaria edulis 7. GcA+ 8. GcB+ 9. GcC+ 10. GcD+ 11. GcE+ 12. GcF+ GcA- GcB-

Armstrong, E., J. D. Mckenzie, and G.T. G. Worthy. 1999. Aquaculture of sponges on scallops for natural products research and antifouling. J. Biotechnol. 70: 163-174. 70. 21-

This experiment does not showed any inhibition zones Bacterial identification The 3 producer and 3 inducer strains which were responded the quorum sensing principles alone were subjected to biochemical analysis for identification. The obtained results revealed that all the producer strains showed sings of Pseudomonas sps and the inducer strains showed signs of Vibrio sps. So, based on the obtained result all the producer strains seems to be a Pseudomonas sps where as all the Inducer strain belongs to the genus vibrio.

Love is such an emotion that is always pure, whether it exists between two heterosexual individuals or two women is inconsequential! Just take your time and express yourself and sexuality however you feel comfortable, you shouldn't have to force yourself to be a certain way, live you r life as you want to.

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.

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.

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.

Quorum sensing usually focused on the bacteria growing in homogeneous environment. However few studies have attempted to a study this principle in heterogeneous environment also. In this present investigation we have attempted to study both homogeneous as well as heterogeneous environment. In former one we have isolated producer strain in seaweed eipbionts and it shows inhibitory activity against the inducer organism at the same seaweed epibionts. Later producer strains from seaweed epibionts, were treated with various Vibrio organisms from different environment. The obtain result of this study shows that the producer strain are capable of secreting antibiotic compounds not only to their natural competitors in its own habitate but also to the pathogen inhabiting in a distant related environment.

According to some studies, pheromones in humans play a big role when it comes to facilitating attraction. In most instances, the effect of pheromones in humans is termed as the X factor that makes some people more appealing to certain groups of people. Scientists believe that like the insects which send out genetic coding when they excrete pheromones to attract their mate, pheromones in humans may also contain some kind of genetic coding which may be easier to decipher by certain types of people.

Some men produce more natural pheromones than others, which is why you can see some men who are not handsome, but have no problems in attracting and seducing the most beautiful women.

We hope that with this article, we have covered more than just a fragment of the available information of pheromones in humans. The world of pheromones in humans is too vast to be covered in a single article.
Author Dave Thomson

pheromones in men | pheromones in papermate pens | pheromones in pen ink | pheromones in perfume | pheromones in honeybees | pheromones in humans |

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