Therefore, CHO ingestion may be an interesting approach to avoid

Therefore, CHO ingestion may be an interesting approach to avoid significant decrements to a player’s performance. Presently, only a few studies have investigated the effects of CHO see more supplementation on tennis performance [13–18]. Moreover, the available data regarding the benefits of CHO supplementation on tennis performance are equivocal. For example, hitting accuracy decreased in the PLA trial when compared to the CHO trial [16]. Similarly, CHO supplementation

maintained ground stroke accuracy and increased muscle power after simulated tennis tournament [17]. Conversely, a previous study did not observe any significant positive effect of CHO ingestion on ARS-1620 cell line serve and ground stroke velocity as well as stroke accuracy during tennis match play [13]. Additional investigations observed similar results showing no significant effect in the CHO condition when compared to a PLA regarding serve velocity or unforced error [14], fan drill speed and click here percentage points won and lost [15] during tennis match play. In contrast, Ferrauti & Weber [18] reported that CHO supplementation improved tennis specific running speed test, but interestingly this

improvement in speed had no effect on stroke accuracy and games won during a match simulation. Ultimately, there have been controversial results regarding the effects of CHO supplementation on tennis performance [13–18], however, the authors of the present investigation hypothesized that CHO supplementation would serve to avoid performance decrement during prolonged tennis match play. Therefore, the aim of the present investigation was to assess

the effect of CHO supplementation on tennis match play performance among nationally ranked young players. Methods Participants A total of 12 (mean Lepirudin and SD: 18.0 ± 1.0 years; 176 ± 3.4 cm; 68.0 ± 2.3 kg; body fat: 13.7 ± 2.4%), competitive male tennis, involved in regular tennis competitions at the national level, with a national ranking between 10 and 55, volunteered to participate in this study. The mean training background of the players was 15 hoursper week, for a minimum of 5 years. Prior to participation, the experimental procedures and potential risks were fully explained to the athletes and their parents. Additionally, written informed consent was obtained from both the players and their parents. Players with any pre-existing medical conditions (i.e. musculoskeletal injuries, metabolic disorders, severe illness) that could have influence in their hormonal responses or performance were excluded from the study. The study protocol was approved by the Human Subject Committee of the University of São Paulo, CAAE: 09860412.6.0000.5391. Experimental design This study was conducted over a 5-day period, in which each player completed 3 hours of simulated tennis match play, on 2 separate occasions (Figure 1). Subjects ingested either a CHO or PLA beverage in a double blind, randomized, placebo-controlled crossover design.

5/OD of growth) [24] Adherence to Caco-2 cells Adherence to Caco

5/OD of growth) [24]. Adherence to Caco-2 cells Adherence to Caco-2 cells was investigated using methods described previously [28]. In brief, cells were cultivated in DMEM medium supplemented with 10% fetal bovine serum and 1% non-essential

amino acids under a 5% CO2 atmosphere. All the experiments were performed on cells between the 15th and 25th passage. Caco-2 cells were cultivated in 24-well plates to a density of 1 × 105 cells/well for 3-5 days. Bacteria were grown to mid-log phase at 37°C without agitation in tryptic soy broth; Caco-2 cells were incubated with bacteria for 2 h at a multiplicity of infection of 100:1. After infection of the monolayer, epithelial cells were washed and lysed with 0.25% Triton-X at 37°C for 20 min and adherent bacteria enumerated by quantitative bacterial counts. Pilot experiments had shown no significant bacterial Selleck Epoxomicin invasion under the outlined

conditions. Isolation and analysis of glycolipids and LTA Bacterial cells were resuspended in 0.1 M citrate buffer pH 4.7 and cell walls disrupted by shaking with an equal volume of glass beads (0.1 mm glass beads, 3 × 1 min intervals using a BeadBeater, Glenn Mills, Clifton, NJ). Glass beads were removed by sedimentation, and disrupted cells were stirred with an equal volume of n-butanol for 30 min. After phase separation by centrifugation, the www.selleckchem.com/products/blz945.html aqueous layer was removed, dialyzed against 0.1 M ammonium acetate (pH 4.7) and lyophilized. LTA was purified from the aqueous phase

by hydrophobic interaction chromatography [4]. The butanol phase was evaporated under a vacuum, and cell membrane lipids were extracted according to the method of Bligh and Dyer and separated by TLC (0.2 mm Silica gel 60 F254 Merck, Darmstadt) using a solvent system of CHCl3/MeOH/H2O (65:25:4, v/v/v) and detection with α-naphthol (3.2%). For detection of phospholipids, TLC plates were stained with molybdenum blue; amino phospholipids were stained with ninhydrin, as previously described [29]. LTA was also analyzed by SDS-PAGE as described previously [5]. Briefly, bacterial cell walls were disrupted by shaking with glass beads as described above, boiled in sample buffer AC220 in vitro containing SDS, and subjected to SDS-PAGE in gradient gels containing acrylamide (4/12% w/v, Invitrogen). Separated LTA was transferred onto PVDF RVX-208 membrane and blocked at 4°C in Tris-buffered saline (TBS) containing skim milk (5% w/v) for 18 h, then incubated at 20-22°C for 2 h with rabbit antibody raised against E. faecalis LTA (see below) diluted 1:200 in TBS/skim milk. After washing in TTBS (Tween 20 0.05% v/v in TBS), the sheets were incubated at 20-22°C for 1 h with a goat anti-rabbit IgG (whole cell) alkaline phosphatase conjugate (Sigma), diluted 1:1000 with TBS/skim milk, and then washed again in TTBS. Binding of the enzyme-conjugated antibodies was detected with the NBI/BCIP (Biorad). For visualization of proteins, SDS PAGE gels were stained with Coomassie blue.

In total, 74 fungal species were probed via the fungal amplicon m

In total, 74 fungal species were probed via the fungal amplicon mixes. The PCR product that was amplified from the ITS region of Arabidopsis thaliana

was added to all amplicon mixes (at a concentration of 5 ng/μl) as a positive hybridisation control. To test the possible use of this custom phylochip for describing ECM community composition Selleck Ralimetinib in environmental samples, 10 μl of the PCR product that was amplified from the bulked ECM root tips of beech and spruce was used (spiked with the amplicon of Arabidopsis thaliana). Six H 89 datasheet technical replicates were carried out for each sample (three block replications per slide × two slides per sample). The results of the cross-hybridisation test are outlined in Figure 1. The ITS-based cladogram was constructed for all tested fungal species using the default setting of the MEGAN software (version 3.0.2., [42]). Array evaluation Prior to further analyses,

spots exhibiting poor quality (for example, as a result of the presence of dust) were flagged and excluded from the analyses. Hybridisation quality was surveyed using the positive (oligonucleotides of Arabidopsis thaliana) and negative controls (five oligonucleotides for the Glomeromycota (non-ECM species) and the one spot spotted with only hybridisation buffer) of each array. Data of the array were further used when (i) signal intensity values of the positive controls were within the group of oligonucleotides that showed the highest signal intensity values CHIR-99021 ic50 and (ii) NU7441 clinical trial the mean signal intensity value of the negative controls were a maximal 1.5% of the signal intensity with the highest value. Individual spots were considered to be positive (species present in the sample) if their signal intensity showed a value that was five-fold higher than the averaged intensity value for all of the negative controls. Additionally, at least four of the six replicates per spot were required to generate a significant positive hybridisation. The threshold factor was fixed to five-fold after evaluation of the results of the arrays that were hybridised with the

known amplicon mixes derived from sporocarp tissues (see “”Sporocarp collection”" and “”Specificity of oligonucleotides”"). Using a threshold factor of “”5″” defined the minimal 90% of all species in the amplicon mixes as positive and filtered most false-positives (cross-hybridisation). Acknowledgements MR is supported by a Marie Curie PhD scholarship within the framework of the TraceAM programme. The array approach was partly funded by INRA, the European projects TraceAM and ENERGYPOPLAR, the European Network of Excellence EVOLTREE, and the Typstat project (GIP ECOFOR). We would like to thank Dr. Melanie Jones (University of British Columbia Okanagan) for her critical reading of the manuscript and helpful comments. We also thank Christine Delaruelle (INRA-Nancy) for her technical assistance with the ITS sequencing.

Anamorphs reported for genus: none Literature: Ahmed and Asad 19

Anamorphs reported for genus: none. Literature: Ahmed and Asad 1968; Ahmed and Cain 1972; Kirschstein 1944; de Notaris 1849. Type species Sporormia fimetaria De Not., Micromyc. Ital. Novi 5: 10 (1845). (Fig. 91) Fig. 91 Sporormia fimetaria (from selleck RO, type). a Appearance of ascomata on the host surface. Note the scattered distribution. b–d Broad cylindrical asci with a short and thick pedicel. e Released filiform ascospores which may break up into part spores. Scale bars: a = 0.5 mm, b–d = 20 μm, e = 10 μm Ascomata 100–150 μm diam., solitary, scattered,

immersed to erumpent, globose, subglobose, wall black; apex without obvious papilla, ostiolate (Fig. 91a). Peridium thin (other characters unknown). Hamathecium of rare, 2–3 μm wide, septate pseudoparaphyses. Asci 70–100 × 13–18 μm (\( \barx = 86.4 \times 14.9 \mu \textm \), n = 10), 8-spored, bitunicate, fissitunicate dehiscence not observed, shortly cylindrical, with a short, narrowed,

furcate pedicel up to 20 μm long, no apical apparatus could be observed (Fig. 91b, c and d). Ascospores 50–58 × 4–5 μm (\( \barx = 54.7 \times 4.8 \mu \textm \), n = 10), fasciculate, broadly filliform, reddish brown, with 16 cells, easily separating into partspores, central cells of the ascospores shorter than broad, rectangular in vertical section, round in transverse section, 4–5 × 2.5–3.5 μm, without visible Selleckchem FG 4592 germ-slits or pores, apical cells usually Miconazole longer than Apoptosis inhibitor broad, 5–6.5 μm long, also without apertures (sheath is reported (Ahmed and Cain 1972), but not observed in this study) (Fig. 91e). Anamorph: none reported. Material examined: 1832, (RO, type, as Hormospora fimetaria De Not.). Notes Morphology Sporormia was formally established by de Notaris

(1849), and only one species was described, i.e. S. fimetaria, which subsequently was selected as the generic type. Sporormia sensu stricto was accepted by several workers, and only includes members with a fasciculate ascospore arrangement, parallel to the ascus, and the part cells of the ascospores lacking germ-slits (Ahmed and Asad 1968; Ahmed and Cain 1972; Kirschstein 1944). Species whose ascospores are not fasciculate and have partspores with germ-slits were assigned to Sporormiopsis by Kirschstein (1944) and to Sporormiella by Ahmed and Cain (1972). Phylogenetic study The generic status of Sporormia in Pleosporales was verified based on a phylogenetic analysis of ITS-nLSU rDNA, mtSSU rDNA and ß-tubulin sequences (Kruys and Wedin 2009). Sporormia clustered together with species of Westerdykella (including Eremodothis and Pycnidiophora), but lacks clear statistical support. Thus, the relationship of Sporormia with other genera of Sporormiaceae is unclear and not resolved yet. Concluding remarks Several coprophilous taxa (e.g.

Desalination 2009, 238:271–280 43 Albuquerque Júnior EC, Méndez

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P-1, a fungal endophyte in Huperzia serrata Chem Nat Compd 47:54

P-1, a fungal endophyte in Huperzia serrata. Chem Nat Compd 47:541–544 Yue Q, Miller CJ, White JF, Richardson MD (2000) Isolation and characterization of fungal inhibitors from Epicloë festucae. J Agric Food Chem 48:4687–4692PubMed Yun K, Kondempudi CM, Choi HD, Kang JS, Son BW (2011) Microbial mannosidation of bioactive

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with the South China Sea sponges. Microb Ecol 62:644–654PubMed”
“Introduction Botryosphaeria was introduced by Cesati and De Notaris (1863). Saccardo (1877) emended the initial generic description and transferred the hypocreaceous species amongst them to Gibberella and Lisea. Because Cesati and De Notaris (1863) did not designate a type species, von Höhnel (1909) suggested Botryosphaeria berengeriana De Not., while Theissen and Sydow (1915) suggested B. selleck compound quercuum (Schwein.) Sacc., which could be regarded as generic lectotypes. Neither proposal was accepted because these species were not included in the original description of the genus (Cesati and De Notaris 1863). Therefore, Barr (1972) proposed B. dothidea (Moug. : Fr.) Ces. & De Not, one

of the species originally included by Cesati and De Notaris (1863), as the lectotype of this genus. This proposal has generally been accepted and Slippers et al. (2004b) proposed a neotype and epitype to stabilize the type species B. dothidea and provided a modern description of this genus based on these new types. Species of Botryosphaeria are cosmopolitan in distribution and occur on a wide range of monocotyledonous, dicotyledonous and gymnosperm hosts; on woody branches, herbaceous Megestrol Acetate leaves, stems and culms of grasses; and on twigs and in the thalli of lichens (Barr 1987; Denman et al. 2000; Mohali et al. 2007; Lazzizera et al. 2008a; Marincowitz et al. 2008. Taxa range in habit from saprobic to parasitic or endophytic (Smith et al. 1996; Denman et al. 2000; Phillips et al. 2006; Slippers and Wingfield 2007; Huang et al. 2008; Pérez et al. 2010; Ghimire et al. 2011; González and Tello 2011), and cause die-back and canker diseases of numerous woody hosts (von Arx 1987; Damm et al. 2007a; Phillips et al. 2007; Slippers et al. 2007; Alves et al. 2008; Lazzizera et al. 2008b; Marincowitz et al. 2008; Zhou et al. 2008; Pérez et al. 2010; Adesemoye and Eskalen 2011; Urbez-Torres et al.

Nanotechnol Sci Appl 2010, 3:53–63 CrossRef 4 Parveen S, Misra R

Nanotechnol Sci Appl 2010, 3:53–63.YAP-TEAD Inhibitor 1 manufacturer CrossRef 4. Parveen S, Misra R, Sahoo SK: Nanoparticles: a boon to drug delivery, therapeutics, diagnostics and imaging. Nanomed Nanotechnol 2012, 8:147–166.CrossRef 5. Lasagna-Reeves C, Gonzalez-Romero D, Barria MA, Olmedo I, Clos A, Sadagopa-Ramanujam VM, Urayama A, Vergara L, Kogan MJ, Soto C: Bioaccumulation and toxicity of gold nanoparticles after repeated administration in mice. Biochem Bioph Res Co 2010, 393:649–655.CrossRef 6. Gu YJ, Cheng J, Lin VX-689 chemical structure CC, Lam YW, Cheng SH, Wong WT: Nuclear penetration of surface functionalized gold nanoparticles. Toxicol Appl Pharmacol 2009, 237:196–204.CrossRef

7. Bai X, Ma H, Li X, Dong B, Zheng L: Patterns of gold nanoparticles formed at the air /water interface: effects of capping agents. Langmuir 2010, 26:14970–14974.CrossRef 8. Asharani PV, Lianwu Y, Gong Z, Valiyaveettil S: Comparison of the toxicity of silver, gold and platinum nanoparticles in developing zebrafish embryos. Nanotoxicology 2011, 5:43–54.CrossRef 9. Pérez Y, Mann E, Herradón B: Preparation and AZD0530 purchase characterization of gold nanoparticles capped by peptide-biphenyl hybrids. J Colloid Interf Sci 2011, 359:443–453.CrossRef 10. Herradón B, Montero A, Mann E, Maestro

MA: Crystallization-induced dynamic resolution and analysis of the noncovalent interactions in the crystal packing of peptide–biphenyl hybrids. Cryst Eng Commun 2004, 6:512–521.CrossRef 11. Mann E, Montero A, Maestro MA, Herradón B: Synthesis and crystal structure of peptide-2, 2-biphenyl hybrids. Helv Chim Acta 2002,

85:3624–3638.CrossRef 12. Montero A, Alonso M, Benito E, Chana A, Mann E, Navas JM, Herradón B: Studies on aromatic compounds: inhibition of calpain I by biphenyl derivatives and peptide-biphenyl hybrids. Bioorg Med Chem Lett 2004, 14:2753–2757.CrossRef 13. Bendová L, (-)-p-Bromotetramisole Oxalate Jureka P, Hobza P, Vondrášek J: Model of peptide bond-aromatic ring interaction: correlated ab initio quantum chemical study. J Phys Chem B 2007, 111:9975–9979.CrossRef 14. Nishio M, Umezawa Y, Honda K, Tsuboyama S, Suezawa H: CH/π hydrogen bonds in organic and organometallic chemistry. Cryst Eng Commun 2009, 11:1757–1788.CrossRef 15. Heaton MJ, Bello P, Herradón B, Campo A, Jimenez-Barbero J: NMR study of intramolecular interactions between aromatic groups: Van der Waals charge-transfer, or quadrupolar interactions? J Am Chem Soc 1998, 120:12371–12384.CrossRef 16. Ranganathan D, Haridas V, Gilardi R, Karle IL: Self-assembling aromatic-bridged serine-based cyclodepsipeptides (serinophanes): a demonstration of tubular structures formed through aromatic π − π interactions. J Am Chem Soc 1998, 120:10793–10800.CrossRef 17. Mann E, Rebek JJ: Deepened chiral cavitands. Tetrahedron 2008, 64:8484–8487.CrossRef 18.

Melting curves were obtained from 55°C to 90°C, with fluorescence

Melting curves were obtained from 55°C to 90°C, with fluorescence measurements taken at every 1°C increase in temperature. All reactions were carried out in triplicate along with a non-template control. Ct values were calculated Temsirolimus cost under default settings for the absolute quantification using the software provided with the instrument. The equation drawn from the graph was used to calculate the precise number of target molecule (plasmid copy no. or number of bacteria) tested in same reaction plate as Z-IETD-FMK standard as well as in sample. Statistical analysis Graph of respective bacterial population is plotted as mean value

with standard error. Each sample was analyzed in triplicate for calculation of significant differences in bacterial population by the Man-Whitney test. P values of 0.05 or below considered as significant. Paired samples collected from healthy volunteers before and after satronidazole treatment were analyzed by

Wilcoxon matched-pairs signed rank test (two tailed). Analysis was done using GraphPad Prism-5 software. Results Screening of E. histolytica positive samples DNA from concentrated cyst was subjected to Dot-blot hybridization. Dot blot analysis of 550 samples yielded selleck chemicals llc 39 samples (7%) that were positive for Entamoeba (Figure 1B). The DNA from Entamoeba positive samples were subjected to PCR using species specific primers of E. histolytica and E. dispar (Figure 2C & D). Out of 39 samples, 17 samples (43%) were positive for E. histolytica. None of the samples Nitroxoline in our study population were found positive for both the species of the parasite. Quantification of predominant flora High quality DNA isolated from E. histolytica positive stool sample was subjected to Real Time analysis

to assess the predominant gut flora that included Bacteroides, Bifidobacterium, Eubacterium, Clostridium leptum subgroup, Clostridium coccoides subgroup, Lactobacillus and Ruminococcus. Two subdominant genera Methanobrevibacter smithii and Sulphur reducing bacteria (SRB) were also quantified. Validation of primers designed by us for the above genera have already been reported [21]. In addition to the above primers, here we report a Real time analysis of nim gene copy number for which a standard curve and amplification curve have been drawn that shows specific and efficient quantification with slope = −3.6 and R2 =0.998 (Figure 3A & B). Figure 3 Real-time analysis for quantification of different bacterial genera in Healthy vs E. histolytica positive (Eh + ve) samples. (A) Bacteroides (B) Clostridium coccoides subgroup (C) Clostridium leptum subgroup (D) Lactobacillus (E) Campylobacter (F) Eubacterium. P value = .05 or below was considered significant. CI stands for confidence interval. Our analysis reveals that during healthy conditions, the members of Bacteroides were the most abundant in number among the predominant targeted genera. However, a significant decrease was observed in population of Bacteroides (p = .

[14] Methods Cell culture T47D cells were obtained from ATCC, an

[14]. Methods Cell culture T47D cells were obtained from ATCC, and Bcap37 cells were obtained from Cancer Institute, Zhejiang University. Bcap-37 is a ERα negative breast cancer cell line that first established in China. T47D, and Bcap37, and Bcap37, which were transfected with empty pcDNA3.1 expression vector (BC-V) or the pcDNA3.1- ERα expression vector (BC-ER), were cultured in RPMI 1640 supplemented with 10% newborn calf serum and 100 U/ml penicillin-streptomycin under 5% CO2 atmosphere with humidity

at 37°C. For estrogen induction Dasatinib solubility dmso assays, the cells were precultured in phenol red-free RPMI 1640 containing dextran-charcoal stripped 10% FBS (Hyclon) for 48 hours and then incubated with 17-βestradiol (Sigma) or ICI182780 (Sigma). Cells were divided into 2 groups according to the preincubation time of 17-βestradiol (E2). In the short-term preincubation group, the cells were preincubated in phenol red-free RPMI 1640 medium containing dextran-charcoal stripped 10% FBS with or without E2 for 16 hours, before they were exposed to chemotherapeutic agents. In the long-term preincubation group, the cells were preincubated in RPMI 1640 medium with or without E2 for 12 days. For T47D cells, fulvestrant was added to RPMI 1640 medium 12 hours before E2

treatment. E2 was used at a concentration of 100 nM in T47D cells and 10 nM in Bcap37 cells. Fulvestrant was used at a concentration of 2 uM in T47D cells and 500 nM in Bcap37 cells. Transfection Cell transfection was carried out using Lipofectamine 2000, according to the instructions of the manufacturer. Briefly, ERα-negative BCap37 cells were placed in a six-well plate selleck chemical at a density of 1 × 106 cells/well and incubated overnight in RPMI 1640 supplemented with 10% FBS. PcDNA3.1-ERα or pcDNA3.1 plasmid DNA 4ug) was diluted in serum-free RPMI 1640 medium (250 ul) and then mixed with the transfection solution for 15 min. Then, 24 hours

after transfection, the PFKL transfectants were selected by incubation in a medium containing G418 (500 ug/ml), until positive clones were discovered after 2–3 weeks. Positive clones were maintained in a medium supplemented with 200 ug/ml G418. Measurement of cell viability by MTT assays Cells were seeded at a density of 8000 cells/well for T47D cells or 5000 cells/well for Bcap37 cells in 96-well microplates. The cells were then buy BIBF 1120 treated with four chemotherapeutic agents, including paclitaxel, epirubicin, fluorouracil and vinorelbine, after preincubation with E2 or fulvestrant. At the end of the culture, 20 ul 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT, 5 mg/ml) were added to each well, and plates were placed at 37°C for 4 hours. Then, 150 ul of dimethylsulfoxide was added to each well to lyse the cells. Absorbance was measured at 570 nm using a microplate reader. Measurement of dead cell rate through the PI dye exclusion tests The dead cell rate was determined by PI dye exclusion tests.

Furthermore, some techniques to analyze the physiological status

Furthermore, some techniques to analyze the physiological status of the cells will be

summarized. Media, culture treatment, and illumination conditions In contrast to inducing micronutrient deficiency in C. reinhardtii, which takes a lot of effort to exclude trace amounts of metal ions from the growth medium (Quinn and Merchant 1998), it is not difficult to deprive C. reinhardtii cells of the macronutrient sulphur (S). Standard TAP medium (Harris 1989, 2009) contains about 0.5 mM of sulphate. 400 μM of the latter derive from the salt solution, and about 100 μM originates from the trace element solution, which contains sulphate salts of Zn, Cu, and Fe. To prepare S-free medium, CP-868596 price the standard GSI-IX order TAP recipe is used, but the Beijerinck’s salt solution is prepared with MgCl2 instead of using MgSO4. Accordingly, the trace element solution contains the chloride salts of Zn, Cu, and Fe. Double distilled water should be used for the preparation of the stock solutions and the media to avoid sulphate contamination. To induce S deprivation in C. reinhardtii, the cells are grown in standard TAP medium in the light and then transferred to S-free medium. For this purpose, the cells are centrifuged as described above, the supernatant is discarded, and the cell pellet is gently resuspended in the original volume of S-free medium. Another centrifugation

step follows, the supernatant is discarded once more, and the cells are resuspended in

S-free medium again. There are several philosophies on how many washing steps should be carried out. Some research groups carry out up to five washing steps (e.g., Kosourov et al. 2002), whereas others wash only once (Hemschemeier et al. 2008). It should be kept in mind that every Geneticin manufacturer centrifugation step affects the algal cells and may induce an anaerobic metabolism already, on the other hand, some sulphate might stick to the cells so that one washing Thalidomide step could be insufficient to remove any S from the cells. The procedure might be chosen according to the experimental aims. An alternative approach to deprive algal cells of S is to inoculate them in a medium with a limited amount of sulphate (Zhang et al. 2002). We experienced that inoculating a low amount of C. reinhardtii cells grown in standard TAP medium in new medium containing 50 μM sulphate (by adding a sterile MgSO4 stock solution to S-free TAP medium) allows them to grow until they reach a chlorophyll content of about 20 μg ml−1. Then, they will pass to the S-deprived stage and induce the set of adaptations figured out below. There is an easy method to check whether the Chlamydomonas culture already experiences S starvation. Several green algal species such as C. reinhardtii secrete a periplasmatic arylsulfatase as soon as they sense limitations of sulphate (Lien and Schreiner 1975).