12/13/2018

Interference With Cell-to-cell Signaling: a Potential Therapeutic Approach Against Vibrio Species 

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.


Does personality figure in sexual attraction? Yes, but so does your perception of a potential mate's personality. According to a research conducted by Klohnen, E.C., & S. Luo in 2003 on interpersonal attraction and personality, a person's sense of self-security and at least the person's perception of his/her partner were found to be strong determinants of attraction in hypothetical situations. What does this tell us? We prefer a certain personality type, which attracts you to a person. But aside from the actual personality of the person, which can only be verified through close interaction through time, it is your perception of your potential partner that attracts you to him/her, whether the person of your affection truly has that kind of personality or not. This could probably account for a statement commonly heard from men and women on their failed relationships: "I thought he/she was this kind of person."
 




Having been given the assignment of writing an interesting presentation on which perfumes contain pheromones, this is what we came up with. Just hope you find it interesting too!

Wagner, V. E., D. Bushneil, and L. Passador. 2003. Micro array analysis of Pseudomonas aeruginosa quorum sensing regulons. J. Bacteriol, 185: 2080 - 2095.

Be as Honest as the Day is Long This isn't a trite clich; but rather it's a clich that offers words to live by on a multitude of levels. Lies are insidious in that they must be fed by more even lies in order to be successful. Unless you plan on carrying around a notebook to keep track of all your fibs, white lies and down right untruths, it's best to just live your life honestly, which is after all, the best policy.

The erotic pleasure that can be derived from swinging is immeasurable. Exploring the side of our sexual nature with our partner and another couple, engaging in group sex, threesomes or all kinds of sexual activities just goes to prove that we are indeed sexual beings and that some of us really feel comfortable with what we are. Swingers represent the kind of people that prefer to go a little further and penetrate into some of the most incredible and almost bewildering sexual fantasies. They find swingers groups with the help of swingers ads and share common thoughts planning meetings and intimate encounters. They just love to be satisfied and most of them have declared that their existing relationships have deeply improved after such experiences.

Avoid trite clichs What could be worse than the "It wasn't you, it was me" statement? No one believes that, and frankly it's insulting and really makes no sense. Since you aren't breaking up with yourself, how could it not have had something to do with the other person? Avoid using these lines as easy ways out since you know they don't really fool anyone. At least put forth some minimal effort and offer some sort of an explanation if the break-up is sudden.

Is attraction a matter of chemistry? Maybe. According to scientists, the attraction between animals of the opposite sex is all about chemicals called pheromones. The effect of pheromones in behavior of insects is the most studied to date. It has been observed, at least in some experiments, that pheromones are responsible for communication among same species and colony of ants. The horrible odor released by skunks to ward off enemies is said to be a kind of pheromone. Some species of apes rub pheromone-containing urine on the feet of potential mates to attract them.

U2- U3- U4- U1+/U1- U2+/U2- U3+/U3- U4+/U4- U1- U2- U3- U4- NIL NIL NIL NIL Sediment 17. SA+ SA- SA+/SA- SA- 28

In this experiment among 17 Producer and Inducer strains only 3 of them have responded to the quorum sensing principle. (BrB+/BrB-), (GcC+/GcC) and (SA+/SA-)

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].

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

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-

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.

Holmstrom, C, and S. Kjelleberg. 1994. The effect of external biological factors on, settlement of marine invertebrates and new antifouling technologies. Biofouling. 8: 147-160.

Hypnea valentiae Rhodophyceae Hypnea pannose Rhodophyceae Hypnea esperi Rhodophyceae Acanthophora spicifera Rhodophyceae ISOLATION OF EPIPHYTIC BACTERIA

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.

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.

"Opposites attract" is a law of attraction, at least where electromagnetism is concerned. But are there laws about attraction between two people? "In a world that is full of strangers" as a line in a famous song of the 1980's goes, is there a clear set of rules that allows two people to fall for each other?

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

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

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

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.

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.

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.

Probably not! There is wisdom in knowing yourself: who you are, your beliefs, values, and dreams. And do not pretend to be someone you are not. Fooling another person by making him/her think that you share the same values and beliefs is only going to cause you both disappointments. When you are healthy in all aspects, attractiveness becomes a consequence and not an end. As mentioned in the Klohnen and Luo's research, a person's sense of self-security matters, perhaps even beyond attraction. But remember: do these things for yourself and not for other people. Only then can you truly harness your attractiveness as a person.

Avoidance isn't the Answer There are some people, cowards, if you will, who choose to end a relationship by doing nothing at all. Going out of their way to avoid the other person, not returning phone calls or e-mails and simply dropping from sight, are all common methods of ending a relationship by taking the easy way out. This leaves a host of unanswered questions for the other party, not to mention absolutely no closure whatsoever.

Cappuccino J. G., and N. Shermann. 1999. Microbiology, A Laboratory manual, Fourth edition, Addison Wesley, New York. Davies, D. G., M. R. Parsek, J. P. Pearson, B. H. Iglewski, J. W. Costerton, and E. P. Greenberg. 1998. The involvement of cell to cell signals in the development of a bacterial biofilm. Science. 280: 295-298.

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.

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.

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.

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

Bainton, N. J., P. Stead, and S.R. Chhabra. 1992. N-(3-oxohexanoyl)-L-homoserine Lactone regulated carbapenem antiobiotic production in Erwinia carotovora. Biochem. J. 288: 997-1004.

Having been given the assignment of writing an interesting presentation on which perfumes contain pheromones, this is what we came up with. Just hope you find it interesting too!



Icebreaker Pheromone Cologne



Table 2: The results of Quorum Sensing analysis of epibiotic bacterial isolates from seaweeds. Seaweed sample Producer organism Inducer organism Cross-species producer with inducer Cross-species supernatant test with inducer Zone of clearance (mm)

The collected seaweed samples were thoroughly washed with sterile seawater to removes the loosely attached bacteria/particles. Seaweed fronds were scrubbed with sterile cotton swabs to obtain epiphytic bacteria. Epiphytic bacterial organism in the swab were inoculated in sterile peptone broth (50% sea water) and incubated at 28??C in an incubated shaker (220 rpm / min) for overnight. After the incubation period the enriched cultures were serially diluted up to 10-8 concentration and 200 microlitre of each diluted samples were transferred into the nutrient agar plate (50% sea water). The plates were incubated at 28??C for 5 days and the plates with crowded colonies were selected. In the crowded plates those colonies, which showed the sign of inhibition zone around its margin to the neighboring colony, were selected and considered as producer strain. The neighboring sensitive colonies were treated as inducer strain. Both producer and inducer strains were streaked repeatedly until to get pure culture. The pure culture were properly labeled and subjected to the quorum sensing analysis.

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.

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

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.

Lemos, M. L, A. E. Toranzod, and L. J. Barja. 1986. Antibiotic activity of epiphytic bacteria isolated from intertidal seaweeds. Microbial Ecology. 11: 149-163.

How do you feel about swinging? Do you consider that such sexual experiences can offer you and your partner some fresh perspective on sexuality-related issues? If you still are not certain if swinging is the best way to go, then read the following article. It will certainly offer you some perspective, plus mention the importance of online swinging communities and where to find swingers ads.

Liming, Y., K. G. Boyd, and D. R. Adams. 2003. Biofilm specific cross species induction of antimicrobial compounds in Bacilli. AppI.Envi.Microbiol, 69:3719-3727.

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.

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

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.

Scientists believe that animals (usually the females) such as insects and mammals send out these chemical signals to tell the male of their species that their genes are different from theirs. This gene diversity is important in producing offspring with better chances of survival. The perfume industry has capitalized on pheromones as a means to increase one's sexual attractiveness to the opposite sex. Animals such as the whale and the musk deer were hunted down for these chemicals.

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

To put it bluntlyIm going to be frank, nobody likes being dumped and few of us take pleasure in being the "dumper" either. The end of any relationship, often inspite of its length, will be a traumatic time for both parties involved where your emotions run rampant. Understanding, compassion, patience and especially, honesty, are the key factors in any successful break up, if there even is such a thing. You must learn how to let go of any relationship that you no longer wish to take part in, while preserving your dignity along with theirs.

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

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.

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.


The adventure and the thrill offered by swinging escaped can help couples rediscover passion without the fear of cheating. Swingers ads are not just for heterosexual couples; they are open for everyone, bisexuals, gay or lesbians. What they are trying to point out that the sexual status is not as important as the exploring sexual fantasies. What is important is that the sense of excitement and opportunity to put dreams into reality can help one reach the highest peaks of pleasure. All with the help of the Internet and online swinging communities!



We had never thought that we could write so much about which perfumes contain pheromones. We just got to writing, and voila, this article.
Author Dave Thomson
 
 
 


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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. ABSTRACT Bacterial biofilms are sessile communities with high cell density that are ubiquitous in natural, medical, and engineering environments; they are fascinating since they are primitive...

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A sleeping Lover lays at the core of many timeless legends. A kiss, or magic potion is needed to awaken her. To grasp the eternal truths displayed so beautifully in these old texts, you need only to see it is not a story. It is instruction to you. It is your guide, your encouragement, your path to be a Hero. Strip away the allusions to sensuality in these old stories. They are the stories of...

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