In Lieu of an Introduction

Nikolai Veresov: Tatiana, in this volume of our journal we publish a selection of your articles. Two of your other articles were published in Soviet Psychology in the 1970s. Introducing you to the readers of that journal, James Wertsch (1978) wrote: "The author … is one of the leading young investigators from the Luria school of neurolinguistics. She has studied and conducted extensive research both with Luria and with A. A. Leontiev, a major figure in Soviet psycholinguistics. Her analysis of inner speech as a mechanism in speech production reveals the strong influence that L. S. Vygotsky has had on Soviet psychology."¹ But first of all, I suppose our readers would be interested in learning more about your life, about events that preceded your scientific achievements. Could you please tell us briefly about your childhood and your family? How did your parents influence your course of life and your occupational choice? What did they do?     

Spinning plates and juggling balls

A PhD thesis is a project with an established goal and a deadline. As such, the tools, strategies and insight of professional project management can be used effectively to improve both research success and personal well-being.A project is a “temporary endeavour undertaken to create a unique product, service or result” [1]. Although this is a generic definition, it pretty much describes any PhD research project. There are many ways to manage a project effectively and efficiently. Unfortunately, most of us are so busy with our science that we forget about the importance of planning and management to our own success, sanity and health. Instead, we approach our first three years of genuine scientific endeavour wide-eyed and unprepared to juggle the hundreds of tiny balls that make up a PhD. Several techniques from the realm of ‘project management'' might therefore be helpful for PhD students who need to plan and manage the many competing demands that doctoral research can place on them.A PhD comprises both the research itself and the acquisition of skills and knowledge that will facilitate your future career. As such, it is of paramount importance to establish your own objectives early on. For example, alongside dividing your project into work packages—smaller projects that might be discrete or might build on each other—it is also essential to define which so-called transferable skills—additional knowledge and experience that might improve your job prospects—you feel will be of greatest use to you, depending on what you want to do after your PhD. The importance of these skills is becoming more widely recognized and taken far more seriously, and you should find that your supervisor is willing to give you the time to pursue them—your institute or university usually requires that he or she does so. More importantly, you should give yourself the time to invest in these skills, as they are going to be vital to everything you do once your PhD project is over.Doctoral research requires a multitude of skills, most of which you will inevitably lack when you commence your PhD programme. The first step is to identify the gaps in your knowledge to plan what skills on which to focus. This will allow you to acquire them in good time, either through professional activities—shadowing a postdoc, teaching undergraduates, joining journal clubs and blogging—or through both internal and external courses and workshops to improve communication, presentation, writing, networking and other skills. In addition to your planned skills acquisitions, you will also have situations arise, in which you need to acquire new skills quickly. The more you plan training activities and skills acquisition in advance, however, the smoother this aspect will be of your PhD. By way of example, part of my own PhD project relates to statistical analysis of data. An early analysis highlighted several areas in which I had to improve my skills, including hierarchical cluster analysis, principal component analysis and χ² testing against standard distributions. Having identified these gaps in knowledge early on in my doctoral programme, I could plan ahead accordingly when and how to acquire these skills.The full scope of your PhD project is usually unknown at the outset, and even the direction of your research might well change before you are finished. ‘Rolling wave planning'' is a technique that allows you to take these facts into account and plan the short-term future in detail, with a high-level provision for medium- to long-term activities. For those new to developing project schedules, I advocate a simple five-step approach. First, make an ordered list of high-level activities needed to achieve your goal. Second, expand this list by adding lower-level activities for which you have a detailed understanding of the scope, for example work to be performed in the next six months. You now have a work breakdown structure. Third, turn this work breakdown structure into a dependency-driven list by adding associations between the activities, for example by adding links to precursor activities that need to be completed before another activity can be started. Fourth, estimate the duration of each activity and extrapolate the start and end dates beginning with the first scheduled activity. Finally, as you progress through your research, and the scope of future activities becomes clearer, update the project schedule with these low-level activities as they become known. This approach of generating a hybrid-level project schedule, and updating with detailed activities as the scope becomes clearer, is known as ‘rolling wave planning''.…we approach our first three years of genuine scientific endeavour wide-eyed and unprepared to juggle the hundreds of tiny balls that make up a PhDThere is a range of professional software to help develop project schedules, but there are also various freeware tools available. Alternatively, you can use one of the many word processing or spreadsheet applications to make a simple Gantt chart. Along with the technical scope of your doctoral research, it would also be useful to include milestones that your institution enforces; for example literature review submission, formal progress reports and thesis chapter outlines. Including these in your rolling wave planning will allow you to keep in mind the bigger picture and the formal aspects that must be completed for your PhD, in parallel with the progress you are making towards your specific research subject.It is of course a cliché, but it is true that ‘failing to plan is planning to fail''. Of course the fluid nature of research makes it difficult to estimate accurately the time that it will take to complete various experiments, especially as a novice researcher. I therefore believe that although experiments do overrun and PhD projects can change, developing a project schedule is not a futile activity. By having a plan, even if it is made up of ‘guesstimates'', you can forecast roughly how much time you have left for your research and roughly what you can realistically hope to achieve. After all, without a plan, how can you predict when you will complete your research, submit your thesis and ultimately gain your PhD?Doctoral research requires a multitude of skills, most of which you will inevitably lack when you commence your PhD programmeThe serious consideration of scope is necessary in any project, but even more when you are simultaneously project manager, research scientist and key stakeholder. This raises various crucial questions regarding scope management: what is my doctoral research all about (the goal), and what work do I need to do to meet this goal? Once this has been agreed between you and your supervisor(s), it is essential to manage the scope of your project—the breadth and number of experiments you will perform—and how this will achieve your goal(s). Furthermore, be specific—knowing exactly what you want to achieve will keep you motivated until you get there.Project managers often use the concept of the triple constraint to manage work: scope, time and cost are intricately linked in a project and the different level of focus that each is given affects the perceived quality (by others) of project deliverables (Fig 1). Project managers understand that any deviation in one of the triple constraints changes one or both of the others. This is where the project schedule really comes into its own by allowing you to forecast when you will complete the agreed goals of your PhD project. For example, is your doctoral programme for a fixed-term period? If so, then once a project schedule has been agreed that uses all of the time available, any project overruns will cause an overrun to the overall PhD. The two main possibilities for a PhD student to manage this situation and bring the projected completion back into acceptable timescales are either to work longer or to reduce the scope or goals of the project, either by conducting fewer experiments to answer the same question or by modifying the depth of the question being asked. This leads to the issue of whether there is a minimum set of goals that need to be achieved, or whether several agreed activities are ‘nice to haves'', but are not crucial for the overall PhD. I believe that your supervisor(s) are best suited to answer questions about the minimum goals and the scope needed to achieve them.Open in a separate windowFigure 1The project management triangle as applied to a PhD. Three competing constraints influence project management: time, scope and cost. The time constraint reinforces that projects are temporary endeavours, and that in most cases have defined timescales (absolute deadlines). The cost constraint refers to the budgeted amount allocated to the project that, from the perspective of doctoral research students, will predominantly be focused on the amount and duration of the stipend awarded, but might also incorporate various expenses such as bench fees, conference fees and consumables. For those changing career, the cost might also comprise an element of salary sacrifice. The scope constraint refers to what must be done, produced or developed to meet the objective of the project, which in the case of a PhD generally comprises the actual doctoral research to be performed, development (and submission) of the thesis, publication of one or more journal articles, presentation at conferences and potentially teaching. The triple constraint principle highlights that any change to one of the constraints will have an impact on one or both of the other constraints. For example, increased scope typically leads to increased time and cost; tight time constraints usually mean that an overrun in activities (such as experimentation) might have a knock-on effect of requiring the scope to be reduced to submit your thesis on time, or increasing the overall amount of time required to complete your PhD. Similarly, a tight budget could mean you cannot gain access to various resources, resulting in either increased time or a reduction in scope. Recently, a fourth component of the project management triangle has been introduced highlighting that along with the three constraints competing with each other, they also interact to form a fourth dimension of quality.If you need to complete your doctoral programme within a specified time frame, then you need to manage your goals and scope mercilessly—do not allow additional research questions or extra experiments to take away precious time. This does not mean that you cannot deviate, but any deviations need to be managed. Remember, whether you wish to remain in scientific research or not, the PhD is a stepping-stone to your future career and not the end goal in itself. Once you have achieved the goals agreed with your supervisor, it is more beneficial for you to write-up your doctoral thesis and move on [2].Good communication is essential in every area of work, but even more so for a PhD as you are simultaneously learning how to research along with doing the research. Often, access to your supervisor is limited by constraints on his/her or your time, which means that clear communication is vital. Do not assume that your supervisor knows every intricate detail of what you are doing; he or she might have a large group in which each member is looking at complementary aspects of a more general topic. It is, therefore, your responsibility to ensure that all your stakeholders—supervisors, postdoc leads and any others involved—know what you are doing and, more importantly, why you are doing it.This is another area in which the apt use of technology can maximize efficiency. Subject to institutional licensing, collaboration tools such as SkillsForge or Evernote can improve communication between stakeholders. For example, meeting minutes, action points to be followed and research results can be uploaded for sharing. Supervisors can then review the material at a convenient time to ensure that they stay up to date with the progress of each student within their research group.As PhD students usually aspire to become research scientists, it is of paramount importance that you learn the correct application of the scientific method and the context in which your work is being done. Before jumping into practical work—wet-lab experiments or computational modelling—it is important to understand the meaning and relevance of your project in relation to existing knowledge and the underlying science. For example, the hypothesis-driven research life cycle in systems biology [3,4]—my own field—advises that computational models should be developed on the basis of wet-lab data relating to the underlying biological system. Almeida-Souza and Baets state that a PhD in science is an opportunity to learn how to tackle problems scientifically and, as such, requires the development of skills in critical thinking, hypothesis formulation and experimental design [5]. I believe that the requirement for these skills is universal across the sciences, and that molecular biosciences and computational systems biology are no different.The serious consideration of scope is necessary in any project, but even more when you are simultaneously project manager, research scientist and key stakeholderTherefore, before the first wet-lab experiment is performed, or the first line of code is written, it is essential that we understand why the experiment is important and what results we might expect to support our initial hypotheses. Furthermore, regarding computational systems biology, I believe that it is also essential for wet-lab and computational researchers to collaborate to ensure both have a consistent understanding of the data and the purpose of the computational model. After all, for the most part, computational models are developed for their predictive capacities and to allow hypothesis generation for subsequent wet-lab experimentation. Baxter et al have extensively covered this area and advocate not only designing the project up-front, but also the need for quality control [6].You need to manage the scope and goals of your PhD mercilessly and, at the same time, be flexible enough to grasp new opportunities. Conversations at conferences, for instance, can open up opportunities for collaboration and take your research in a direction that you had not considered previously. In my case, I was invited to turn a conference paper relating to my masters degree into a full paper for a special issue of a well-known bioinformatics journal. Although it was not related to my doctoral research, the prospect was too good to turn down. I therefore discussed the idea with my PhD supervisor, and once we were in agreement, I updated the project schedule to incorporate this new activity, trying to mitigate as much as possible the resulting slippages to my doctoral research. In essence, I had performed an impromptu risk–reward analysis and decided that the reward that would be gained from publishing this work outweighed the risk of a slight overrun of my PhD thesis. It must be noted that I was lucky in this instance, as my PhD supervisor also supervised the research project during my master''s degree, so a full paper would be beneficial for both of us.A project risk is “an uncertain event or condition, that if it occurs, has an effect on at least one project objective” [1]. The positive side to risks is that the likelihood of their future occurrence can be mitigated by planning in the present. Once a risk is realized, however, and its effects begin to be felt, it has turned into a project issue. The first step in trying to manage risks is their identification. Risk identification in this context is the process of determining which events, if they occurred, would affect your research. In the context of a molecular biosciences PhD, I believe that general risks relate to access to resources, such as people—postdocs and collaborators, for example—reagents, cell lines and shared equipment. For example, if your work uses fluorescent proteins within single cell analysis, how would you be affected if the fluorescence microscope was booked out by another research lab? Similarly, in computational systems biology, if the design process for your computational model requires access to wet-lab data, what would the effect(s) be if this was not available?Once risks are identified, it is important to develop risk response plans. By using the above example of access to a microscope, what should your response be if you cannot gain access? The initial risk response would be to liaise with the other research lab to understand their requirements and ascertain whether you could gain access at a mutually convenient time. Alternatively, another approach might be to work outside normal office hours, either throughout the evenings or on the weekend, subject to health and safety procedures at your institution and your own health and well-being. I believe that a degree of creativity is often required when developing effective risk response plans.A PhD thesis is a hefty document that might run to many hundreds of pages. They are generally not written as a single large document from start to finish, but as chapters. In the molecular biosciences, a thesis consists of an initial literature review early in the doctoral programme, work-in-progress documents for materials and methods, experimental results throughout the middle section, which is followed by analysis and critical evaluation towards the end of your experimental work. Whether through software tools or through your own manual methods, such as keeping a configuration log and keeping a copy of each version of your working documents, it is essential that you maintain an up-to-date repository of all your notes. I have found through experience that it is beneficial to save not only the final versions, but also each of the working drafts of documents generated throughout your PhD. Ideas previously discounted, and thus removed from more recent versions of documents, might once again take centre stage at a later date.The positive side to risks is that the likelihood of their future occurrence can be mitigated by planning in the presentThis can be aided through the development and use of a project library with a logical folder structure to facilitate easy access to documentation. Noble [7] provides an in-depth discussion of organizing your computational biology project—in particular the value of version control—but the concepts are transferable across disciplines. Furthermore, do not forget to back-up your work, and without seeming too pessimistic, back-up your back-up!Finally, look after the most important resource: you. Exercise, diet, alcohol, caffeine and holidays all affect your well-being. Holidays and time away from the lab or office allow you to take a step back from the detail and reflect on your experiences and progress. Sometimes, time off allows you to process issues subconsciously and develop new approaches to overcome problems that you have been tackling for extended periods of time without success. Finally, holidays also help you recharge your batteries and enthusiasm to return to your project with fresh vigour. If you have sensibly and reasonably planned time off alongside your work, you will be able to enjoy it.Although a PhD requires consistent commitment, you simply cannot—and should not—work at full capacity all of the time. Issues arise periodically throughout any project, and if you have no reserves of energy—either mental or physical—you will be unable to tackle them head on with the step change of performance that is required. Furthermore, doctoral research is a marathon and not a sprint; we all experience the symptoms of burnout from time to time, and sometimes it is better to walk away for a short period to recharge than to carry on, become stale, and ultimately slow down.To conclude, I wish you good luck with your doctoral research, and I hope these techniques help you to manage your PhD project through to successful completion.? Open in a separate windowRichard Alun Williams     

Chromatium glycolicum sp. nov., a moderately halophilic purple sulfur bacterium that uses glycolate as substrate

From the microbial mats that develop in Solar Lake, a new purple sulfur bacterium was isolated. This strain (Chromatium strain SL 3201) was morphologically similar to Chromatium gracile and Chromatium minutissimum. Chromatium SL 3201 was found to be a moderate halophile with a growth range between 2 and 20% NaCl (optimum 4–5% NaCl) and was able to grow photo-organotrophically using glycolate and glycerol. It is the first described phototrophic sulfur bacterium able to use glycolate. According to NaCl requirements and utilization of organic compounds, the strain is not related to any known species of the genus Chromatium. On the basis of its 16S rRNA gene sequence, it clusters with other Chromatium species and is most similar to Chromatium salexigens and Chr. gracile, but it is sufficiently separated to be considered as a new species of the genus. It is, therefore, described as Chromatium glycolicum sp. nov. Received: 17 June 1996 / Accepted: 4 November 1996     

Distinct functions of the Drosophila genes Serrate and Delta revealed by ectopic expression during wing development

 The Drosophila gene Serrate encodes a transmembrane protein with 14 epidermal growth factor-(EGF)-like repeats in its extracellular portion. It has been suggested to act as a signal in the developing wing from the dorsal side to induce the organising centre at the dorsal/ventral compartment boundary, which is required for growth and patterning of the wing. Ectopic expression of Serrate during wing development induces ectopic outgrowth of ventral wing tissue and the formation of an additional wing margin. Here we present data to suggest that both events are mediated by genes that are required for normal wing development, including Notch as receptor. In order for Serrate to elicit these responses the concomitant expression of wingless seems to be required. The lack of wings in flies devoid of Serrate function can be partially restored by Gal4-mediated expression of Serrate, whilst expression of wingless is not sufficient. Ectopic expression of Delta, which encodes a structurally very similar transmembrane protein with EGF-like repeats, provokes wing outgrowth and induction of a new margin under all conditions tested here, both on the dorsal and ventral side. Our data further suggest that Serrate can act as an activating ligand for the Notch receptor only under certain circumstances; it inhibits Notch function under other conditions. Received: 26 april 1996 / Accepted: 24 May 1996     

Disproportionation of inorganic sulfur compounds by the sulfate-reducing bacterium Desulfocapsa thiozymogenes gen. nov., sp. nov.

A new strictly anaerobic, gram-negative bacterium was isolated from the sediment of a freshwater lake after enrichment with thiosulfate as the energy source. The strain, named Bra2 (DSM 7269), is able to grow by disproportionation of thiosulfate or sulfite to sulfate plus sulfide. Elemental sulfur is also disproportionated to sulfate and sulfide, but this only supports growth if free sulfide is chemically removed from the culture, e.g., by precipitation with amorphous ferric hydroxide. Growth is also possible by coupling the reduction of sulfate to sulfide with the oxidation of ethanol, propanol, or butanol to the corresponding fatty acid. The cells are rod-shaped, motile, and have genomic DNA with a mol% G+C content of 50.7. Cytochromes are present, but desulfoviridin is not. The new strain was shown to be related to, but distinct from members of the genus Desulfobulbus on the basis of physiological characteristics and by comparative sequence analysis of its 16S rDNA. Strain Bra2 is described as the type strain of a new taxon, Desulfocapsa thiozymogenes gen. nov., sp. nov. Received: 29 January 1996 / Accepted: 31 May 1996     

Reminiscing briefly about Environmental Biology of Fishes (1976–2002)

The Truth must dazzle gradually Or every man be blindEmily Dickinsonin Margulis & Sagan (1997, p. 1)As time goes by, earlier memories fade and new realities take over (even for heroes of Casablanca, see Walsh 1998). For these reasons a recorded history is useful, even as I wish there would be no need to write this. It all started when I hesitantly accepted an invitation from a small – by present standards – but a prestigious publishing house in The Hague to start a new journal. (I had just published with them a monograph on my work in Africa – Balon & Coche 1974.). Fearful to commit myself, I was strongly encouraged by several colleagues, among them the late J.C. (Cam) Stevenson, then the editor of the influential periodical the Journal of the Fisheries Research Board of Canada. He convinced me that there was a need for an independent journal, as only publications supported by the government (like his own) or by some professional societies were then available. Editors of these journals, Cam claimed, were not free to publish ideas that contradict government policies or offend mainstream beliefs. Thus, much of the new or irritating findings and conclusions were censored (see Balon 2002). Make sure, Cam advised, that your contract with the commercial publisher incorporates a clause that the content of the journal is solely your responsibility. The clause was incorporated. The name Environmental Biology of Fishes was proposed by colleagues, and I did not like it very much initially but was convinced by them that, although almost oxymoron, it fulfills an advertizing role similar to something like Nite Club. The Publisher's winning cover artwork – the naive fish tail up – I hated at first as very undignified but realized soon its attention attracting design on the library shelves and became used to it (later I even played with designing other covers of the hardcover spinoffs Developments in Environmental Biology of Fishes in a similar manner).     

Efficient selection of hygromycin-B-resistant Yarrowia lipolytica transformants

 The yeast Yarrowia lipolytica was shown to be sensitive to the aminoglycoside antibiotic hygromycin B. Spontaneous resistants appeared at a frequency of (2–5)×10^-7 in media containing 100 mg/l drug. In order to develop a new selective marker for the transformation of this yeast, we constructed new plasmids expressing the Escherichia coli hygromycin-resistance gene (hph) under the control of the promoter and terminator sequences of the strongly expressed XPR2 gene of Y. lipolytica. Direct selection of hygromycin-B-resistant transformants on complete medium was very efficient and resulted in transformation frequencies comparable to those observed with conventional auxotrophic markers. This new marker can be used for integrating single copies of plasmid and for gene disruption and provides a convenient tag for genetic studies. Received: 16 February 1996/Received revision: 12 April 1996/Accepted: 15 April 1996     

Self‐ownership,relational dignity,and organ sales

Material property has traditionally been conceived of as separable from its owner and thus alienable in an exchange. So it seems that you could sell your watch or even your kidney because it can be removed from your wrist or abdomen and transferred to another. However, if we are each identical to a living human animal, self‐ownership is impossible for self‐separation is impossible. We thus cannot sell our parts if we don't own the whole that they compose. It would be incoherent to own all of your body's parts but not the whole body; and it would be arbitrary to own some but not all of your removable parts. These metaphysical obstacles to organ sales do not apply to the selling of the organs of the deceased. The human being goes out of existence at death and is not identical to the body's remains. Any objections to selling the organs of the deceased must instead be due to dignity rather than metaphysical or conceptual considerations. But the remains lack the intrinsic dignity of the human being, instead possessing, at best, relational dignity. Relational dignity would not provide sufficient reason to prohibit life‐saving sales.     

Production of methoxyphenol-type natural aroma chemicals by biotransformation of eugenol with a new Pseudomonas sp.

In our screening program for microorganisms that are able to metabolize eugenol, the main component of the essential oil of the clove tree Syzigium aromaticum (sy. Eugenia cariophyllus), we found a new Pseudomonas sp. that produces several substituted methoxyphenols when eugenol is fed to the culture. A taxonomic characterization of this new organism has been performed. Examples of the biotransformation products, produced in high amounts, were vanillic acid with 3.25 g/l within 99 h, ferulic acid with 5.8 g/l within 75 h and coniferyl alcohol with 3.22 g/l within 47.5 h. By changing the culture conditions the ratio of the different metabolites could be varied. Based on these results a scheme for the degradation of eugenol by this strain has been established. Received: 1 April 1996 / Received revision: 24 June 1996 / Accepted: 1 July 1996     

Cylindrobulla and Ascobulla in the western Atlantic (Gastropoda, Opisthobranchia, Sacoglossa): Systematic review, description of a new species, and phylogenetic reanalysis

Two often-confused western Atlantic shelled opisthobranchs - Cylindrobulla beauii P. Fischer, 1857, and Ascobulla ulla (Marcus & Marcus, 1970) - are redescribed and compared, via a full literature review, scanning electron microscopy of shells and radulae, and serial histological sectioning of soft anatomy. A third sympatric species, C. gigas, from Florida, the Caribbean and Bermuda, is described as new, and also provides the first larval development data for the genus. The overlapping classificatory histories of the genera Cylindrobulla and Ascobulla are summarized and discussed with reference to the Cephalaspidea, Sacoglossa (= Ascoglossa), Anaspidea, and Diaphanoidea. Two of the most-recent studies (Jensen 1996u, Jensen 1996h; Mikkelsen 1996) have resulted in conflicting conclusions about the relationships and classification of Cylindrobulla. In the author's earlier phylogenetic analysis (Mikkelsen 1996), Cylindrobulla formed a monophyletic group with the shelled Sacoglossa with synapomorphies in digestive, reproductive, pallial, and nervous system characters. Jensen's two-part study (Jensen 1996a, Jensen 1996b) resulted in removal of Cylindrobulla to a new opisthobranch order, Cylindrobullacea. These two divergent cladistically produced classifications were tested by critically re-evaluating Jensen's dataset, especially with regard to Cylindrobulla, and re-running the analysis. Thirteen of Jensen's 52 characters were recoded for Cylindrobulla according to new morphological data and the new species described here. Other coding changes were required to update anatomical data for other taxa, add supplementary characters and taxa, more clearly define the outgroup, and to critically re-evaluate the cladistic criteria behind several characters. The resultant reanalysis produced a shorter tree using fewer a priori assumptions, but nevertheless preserved the basic tree topology, including three monophyletic sacoglossan clades, presented by Jensen (19966). Cylindrobulla, however, rejoined the shelled sacoglossans (Oxynoacea), supported by two synapomorphies. This analysis therefore reconfirmed Cylindrobulla's proper placement in the Sacoglossa, rather than in the traditional Cephalaspidea or segregated in its own monogeneric opisthobranch order. © 1998 The Norwegian Academy of Science and Letters     

Desulforhopalus vacuolatus gen. nov., sp. nov., a new moderately psychrophilic sulfate-reducing bacterium with gas vacuoles isolated from a temperate estuary

A new type of gas-vacuolated, sulfate-reducing bacterium was isolated at 10° C from reduced mud (E₀ < 0) obtained from a temperate estuary with thiosulfate and lactate as substrates. The strain was moderately psychrophilic with optimum growth at 18–19° C and a maximum growth temperature of 24° C. Propionate, lactate, and alcohols served as electron donors and carbon sources. The organism grew heterotrophically only with hydrogen as electron donor. Propionate and lactate were incompletely oxidized to acetate; traces of lactate were fermented to propionate, CO₂, and possibly acetate in the presence of sulfate. Pyruvate was utilized both with and without an electron acceptor present. The strain did not contain desulfoviridin. The G+C content was 48.4 mol%. The differences in the 16S rRNA sequence of the isolate compared with that of its closest phylogenetic neighbors, bacteria of the genus Desulfobulbus, support the assignment of the isolate to a new genus. The isolate is described as the type strain of the new species and genus, Desulforhopalus vacuolatus. Received: 4 March 1996 / Accepted: 17 June 1996     

Isolation and Characterization of Thermophilic Bacillus spp. from Geothermal Environments on Deception Island,South Shetland Archipelago

Abstract Ten bacterial strains isolated from water and sediment samples taken from geothermal areas of Deception Island, in the South Shetland archipelago, were found to represent six distinct types of thermophilic, Gram-positive, aerobic, catalase positive, endospore-forming rods, identified as Bacillus sp. Six representative strains were subjected to routine phenotypic characterization, numerical taxonomic, and chemotaxonomic analyses. Two isolates were identified as thermophilic strains of B. licheniformis and B. megaterium, but the four other strains could not be identified as known species of Bacillus and, hence, may represent new ones. Received: 28 March 1996; Accepted: 29 August 1996     

Connecting domination contracts

In Black Rights/White Wrongs, Charles Mills continues his critique of contemporary American political philosophy for ignoring issues of racial oppression, and in particular for ignoring the way that liberal social contracts rest on underlying domination contracts. In this commentary, I will discuss some of the new research inspired by Mills’ account of domination contracts, including recent accounts of the “capability contract” and the “species contract”, and explore how they relate to Mills’ own work on the “racial contract”. While this new research on diverse domination contracts confirms the richness of Mills’ analysis of the social contract tradition, it may also require some revisions to his own preferred vision of how we theorize racial justice.     

Adjusting to your new job

Having done the hard work in winning your new job, you might find fitting into a new environment to be just as demanding. Don't make the common mistake of focusing solely on work and getting results. You need to pay equal attention to nurturing good relationships with your new colleagues. Here are a few more hints to help ensure that you get off to the best possible start.