Posts Tagged “PLoS ONE”
Infections in the teeth implants are dreaded, running a high risk of potentially affecting the jaw bones. It is actually not that uncommon. The overall number of performed teeth implantations in the US and Europe has doubled over the last decade, yet studies show that 10 percent of the implants are associated with problems, usually in the first year directly after the operation. To prevent any further deterioration, the implants sometimes have to be removed.
New methods are now being developed by researchers in the University of Zurich to keep inflammation-causing bacteria at bay. In their PLoS ONE article, they present their materials and methods, which have successfully eliminated 99% of the microbes after a 15-minute electrical treatment.
Conventional treatment methods of this sort of inflammation depend on the utilization of topical antibiotics, which is surely a burden for the patient. The aim of the study was to develop a non-invasive approach to efficiently fight off the bacteria, or, as the researchers phrase it in their paper, to develop “an in-situ decontamination of the dental implants”.
The whole idea is based on the process of water treatment, where sterile water is produced through electrolysis. In order to simulate the conditions in the jaw, an Escherichia coli bacterial film was coated onto the titanium implants, which were impregnated in a gelatinous preparation. In the experimental design, one implant functioned as the cathode and the other as the anode. The implants were subjected to a 15-minute-long electrical treatment, of an intensity ranging between 0 and 10 Milliampere. This artificially generated electrical field caused the hydroxyl ions of the water molecules to migrate to the cathode, and thus raising the pH. A color change of the indicators, used in the gelatin, prove that an alkaline environment predominates at the cathode. On the other hand, the pH value drops at the anode, forming an acidic milieu.
The numerous experimental models with various electrical intensities show that in cases, where an acidic ambience was produced around the implants, 99% of the bacteria died off after a 15-minute treatment. Therefore, the patient implants in the future will take up the role of the anode. A clip at the lip will be used as a cathode.
What at first glance might seem as a torture mechanism is in reality completely harmless. The minute amount of Milliampere, which is sufficient to conquer the bacteria, is hardly even perceived by the patient and would tops cause a mild muscle twitching.
, escherichia coli
, PLoS ONE
, teeth implant
, Universität Zurich
, zurich university
3 Comments »
I had the chance to attend this interesting webinar hosted by Pubget, a new search engine for life-science PDFs. The webinar was held on Friday, December 11, 2009 (you can catch the recording here). There were 160 attendees and the GoToWebinar tool enabled live interaction with the speakers.
The webinar meant to have speakers who are experts in their areas and to cover different segments dealing with searching, analyzing, and reusing scientific articles. The webinar was moderated by Ryan Jones, President of Pubget, and the speakers represented:
- Publishers: Peter Binfield, Managing Editor, PLoS One
- Libraries: Marcus Banks, Manager of Education and Research Services, UCSF
- End Users: Ansuman Chattopadhyay, PhD, Bioinformatics, University of Pittsburgh
- Tools: Ramy Arnaout, MD PhD, Chairman and CEO, Pubget
Peter Binfield talked about his experience with PLoS One as a journal established in the digital era, and all of its content is digital. He was much concerned with how to monitor the “reuse” of an article and the tools incorporated in PLoS to achieve that. PLoS uses multi-dimensional, article-level metrics rather than a monolithic system like impact factor. PLoS metrics system enables every one to know the exact usage of an article, downloads and views. PLoS also enables commenting, rating, discussing, selecting a part/line and writing a note about it, sharing/bookmarking, and showing trackbacks to blogs and citations.
Marcus Banks said that the digital “libraries” are still in need of a librarian to analyze, organize and link publications. He also talked about the need of a tool that enables researchers to highlight only the parts of a publication that they need, instead of consuming time reading through the whole publication. He talked about sharing tools like: Zotero, Mendeley, Del.icio.us, RefShare, CiteULike, and Pubget.
Representing the end-users was Ansuman Chattopadhyay on the stand. His presentation was entitled: “Beyond PubMed: Next generation literature searching”. With PubMed, it’s difficult to narrow down your search and reduce the number of the results/hits, but this could be achieved by the newer Google-like tools such as:
- GoPubMed, which gives the users suggestions as they are typing
- Novoseek, which categorizes search results into: diseases, pharmacological substances, genes/proteins, procedures, organisms, etc.
and text-similarity tools like:
- eTBLAST, a web server to identify expert reviewers, appropriate journals and similar publications (the paper)
- JANE, Journal/Author Name Estimator
One point I didn’t get is the need of a “daily journal of negative results”.
Ramy Arnaout presented Pubget as a search tool that is:
- like an on-the-web Acrobat Reader (the search results are the PDFs of the papers)
- able to deliver science at speed
- legal and free, as researchers use their institution’s license to get to all publications including the non-open-access ones
- user-friendly, as a user chooses from a list of publications a paper that opens in the same window
The concerns that all four speakers expressed at the end of the webinar were mostly:
- How to achieve the balance between delivering science and preserving copyrights, a problem that is being partly solved by Open-Access journals.
- How to tell the end-user what is related to his/her field.
- Although everything is “online”, the challenge is how to get to it and use it.
- How to interact with the end-users and make them discover the tools/features of search engines, this can be solved by workshops and tutorials.
I do thank Pubget for giving me the chance to attend this very informative webinar by making it freely available.
Edited on Dec 22, 2009 09:31 p.m. CLT
Tags: Ansuman Chattopadhyay
, double-matrix technology
, Marcus Banks
, Peter Binfield
, PLoS ONE
, Ramy Arnaout
, Ryan Jones
, scientific articles
, sharing tools
, University of Pittsburgh
3 Comments »
Meeting a scientist is like reading many books in few minutes, books of science and books of life. To me, though, meeting Dr. Niyaz Ahmed (1) was like reading a library. He is one of the most active advocates for Open Access (OA) and open evaluation of science. His support for OA is not just by words, but through sharing effectively in such purpose as he is a section editor of Microbiology and Genomics in PLoS ONE and a chief editor in Gut pathogen, the official journal of ISOGEM (the International Society for Genomic and Evolutionary Microbiology), in Sassari, Italy, of which Dr. Ahmed is a co-founder and the General Secretary. ISOGEM members work on developing post-genomic ideas to serve the public health and the environment. Dr. Ahmed is one of the faculty members of Faculty of 1000 Biology, the expert guide to the most important advances in biology.
Dr. N. Ahmed’s early start was in India as he graduated in Veterinary Medicine and obtained his Masters degree in Animal Biotechnology, then his PhD in Molecular Medicine. Currently, he is also based in India, in Hyderabad University as an Associate Professor of Biotechnology and a staff scientist in the Center of DNA Fingerprinting and Diagnostics in Hyderabad. This is not everything about him, his homepage reveals more, especially those pioneer achievements in the research world in India, like being a co-principal investigator of the Mycobacterium W genome program, India’s first whole genome sequencing project, and the most amazing part of his research is working on Helicobacter pylori chronological evolution and phylogeographic analysis.
Having read about all these achievements, I had many questions in mind, but, knowing how busy he is, I tried to reduce them to the following few questions that cover different areas of his activities. Dr. Ahmed generously agreed to answer them all.
Dr. Niyaz Ahmed, any microbiologist would be honored to meet you, and so am I. I am one of the “Micro Writers” blog members; we are young enthusiastic students from Faculty of Pharmacy, Cairo University in Egypt, mostly undergraduate and some graduate students, who are looking from the blog window towards the research world. Most of us wished someday to become scientists; “Micro Writers” is like the first real step on the right way. Our blog focuses on different areas of microbiology. It is like a message by students so far from Egypt, but hopefully from other places as well, to students all over the world. I read a lot about your achievements, especially those concerning the H. pylori phylogeographic analysis. As you have a great experience in research, reviewing articles and especially because you own a blog, I would like to ask you a few questions, and get them published with your answers on the blog, in order to teach and guide not only us, but the all students from everywhere.
Since you are working on the population structure of H. pylori, and on their chronological evolution, can the phylogeographic analysis of bacterial strains lead to infection control or innovative treatment? If yes, how?
N.A: It may not directly lead to product development as such, but, it can definitely explain how the spread-patterns of this organism are? and that has a lot of bearing on infection control in terms of tracking the infection sources. Also, knowing separate lineages in greater details offers accurate diagnostic development which in turn helps keep a tab on their emergence or otherwise.
If phylogeographic analysis can teach us about migration of some strains from one place to another, can we use it in a reverse way? I mean can we use this analysis to learn about the origin of mankind, and his migration routes?
N.A.: Indeed, we can do that. For a bacterial parasite to become a surrogate marker of human history (including migrations), it needs that its population structure mimics with that of the host. It is now established that H. pylori has most probably coevolved with its human host and thus its population structure is juxtapose to the human population structure. Therefore, we can use it as a marker of human history and geography.
Concerning the unpublished ideas of your studies, which suggest that bacterial proteins may be able to perform both the immune stimulatory and immune evasion tasks, the simple question is, do you think bacteria are smart? Do they have that smart controlling machinery that is able to distinguish between all these factors?
N.A.: The term ‘smart’ is reserved for humans. However, we can say that bacteria are highly adaptable. Several bacterial traits such as quorum sensing, community interactions (such as that seen in biofilm formation), molecular mimicry, immune evasion, dormancy etc. definitely point towards their being ‘intelligent’.
You talked about the host-pathogen relationship. I would like to add one more suggestion, which is that bacteria may face the immune system or the host body as a community of workers, not as independent cells. It is like the idea of sociomicrobiology in biofilms. Does this social behavior apply to other communities of bacteria other than bioflims, e.g. the community of H. pylori cells against the human defense system in the stomach?
N.A.: Indeed there is a body of evidence coming in via both in vitro and in vivo observations that H. pylori cells tend to form biofilms which is favored by gastric mucin and by mutations of luxS, and the cagE type IV secretion gene. This observation is important to understand H. pylori’s resistance to host immune responses and antibiotics, and in microenvironmental pH homeostasis which conditions and streamlines the growth and survival of H. pylori in vivo.
You mentioned at your homepage that strains of H. pylori in the Southern Asia are not life-threatening in the same time they may cause gastric cancer in the West. Do you think the lifestyle in Southern Asia, especially the food (extra-spicy food), might lead to evolution of these non-lethal strains, and vice versa in case of the western lifestyle?
Adoption of open access (OA) in science, isn’t it a huge responsibility, with great challenges, most probably the funding challenge? I mean, who will pay always for open access science?
N.A.: Open Access is a reality and the most practical approach to augment knowledge sharing towards science education, research and the practice of medicine and agriculture. Developing countries that have brains but no library budgets and that have been until now deprived of access to knowledge will be at a great benefit with this OA revolution. I do not see any challenge here as funding agencies such as NIH, Howard-Hughes Institute and Welcome Trust have already started subsidizing costs for OA in a big headway.
You started in India; did you feel some bias (in the international journal publishing) towards some western countries (e.g., USA, Germany, France, UK, etc.)? Do you think that the researchers from the developing countries should be encouraged in a way or another, especially against the fees and restrictions of publishing?
N.A.: I firmly believe that originality and novelty have no barriers. If your ideas are novel and your findings well defended, no one can stop them from seeing light of the day. Developing country scientists are equally respected – I can cite my own example, I was made Section Editor at PLoS ONE to oversee an extremely important area, microbial genomics; for this appointment, my affiliation and my geographical co-ordinates were not the important criteria but my standing in the field of medical microbiology, the efficiency with which I handled the issues and my professional commitment to the cause and ethos of OA publishing. However, there may be exceptions of which I have no idea. Nevertheless, this is a free world and if one has zeal and dedication, success is not that far. These days, publication restrictions based on novelty or being on ‘cutting edge’ or otherwise, are no issues. Developing country scientists are thus free to bring forward their research even on topics which may not be interesting to a few ‘glamour magazines’ of science, but they are welcome at descent venues such as PLoS ONE; they are free to even send in aspects of their folklore medicine, their local environmental problems, cropping, local biodiversity, energy production, their cultural and human anthropological aspects (and topics cutting across these) wherein no one is their competitor! Fees for publication is not a problem, PLoS and Biomed Central both waive off publication charges quite generously in almost all cases of genuine inability to pay.
In an old interview, you said that blogs are a good chance for young scientists to express their ideas for free, what about the older scientists in the developing countries who need more space to express their research activities, in the same time so many restrictions are imposed on them to get their papers published in the international journals?
N.A.: Old, and young, all need to be part of the dialogue. Even for busy academics, blogs are extremely helpful although they are no alternative to a proper publication of results or viewpoints. Blogs can effectively blend zeal and enthusiasm of ‘young Turks’ with the experience and patient advice of the ‘old guards’. Academic institutions in the developing countries should support such portals wherein students and faculty discuss research to arrive on novel interpretations and provocative ideas in an interdisciplinary environment of learning and enabling.
As an editor and reviewer in so many journals, what is your advice to some young Egyptian researchers like us in the “Micro Writers” blog who work with the fewest capabilities and with minimal resources, to get our papers published in an easier way?
N.A.: I love the Micro Writers Blog. You are the torch-bearers for all other undergraduate students in our countries of the developing world. My advice is try hard to deliver your best. Do not write on complaints – write about solutions! Do not present as Egyptian, or African, think globally, be a part of global community in the best interests of humanity, the environment and wellbeing of all creatures. I can quote from the Holy Qur’an: “Wallatheena Jaahadu Feena Lanahdiyannahum subulana” (The more you dedicate yourself and strive hard, the more will be the opportunities and paths widened for you from the Almighty). (2)
Finally, I would like to thank you Dr. Niyaz for the time you gifted for us to answer my questions with plentiful ideas, objects, and words. I am quite sure, each one who reads this interview will get benefited more than once.
Dr Niyaz Ahmed (left) co-ordinating a ‘student-scientist-administration’ meeting with Nobel Laureate Prof. Peter C. Doherty (center) and Australian High Commissioner to India, Mr John McCarthy (right).
(1): Dr Niyaz Ahmed, PhD
General Secretary, ISOGEM
Section Editor, PLoS ONE
Chief Editor, Gut Pathogens
Assoc. Editor, Ann Clin Microb Antimicrobials
Assoc. Editor, Acta Veterinaria Scandinavica
Faculty Member, Faculty of 1000 Biology
Corres. Fellow, Eur Helicobacter Study Group
(2): EL-Qur’an El-Karim, chapter #29 (El-Ankaboot), verse #69.
Image credits: Dr. Niyaz Ahmed.
Tags: Academic institutions in the developing countries
, bacterial dormancy
, Biomed Central
, cagE type IV secretion gene
, chronological evolution
, developing countries
, Egyptian researchers
, Faculty of 1000 biology
, gastric cancer
, gastric mucin
, Gut pathogen
, Helicobacter pylori
, host-pathogen relationship
, Howard-Hughes Institute
, Hyderabad University
, immune evasion
, microenvironmental pH homeostasis
, Niyaz Ahmed
, open access
, phylogeographic analysis
, PLoS ONE
, quorum sensing
, smart bacteria
, the Center of DNA Fingerprinting and Diagnostics
, Wellcome trust
3 Comments »