ALMT1 is a single major gene for Al tolerance in wheat Delhaize

ALMT1 is a single major gene for Al tolerance in wheat. Delhaize et al. [151] reported that wheat malate transporter gene ALMT1 significantly improved Al tolerance in transgenic barley. Transgenic plants showed robust root growth and unaffected root apices under certain levels of Al stress. Similar results were also reported by Pereira et al. [152] who transformed TaALMT1 into wheat line ET8 using particle bombardment. T-2 lines showed increased gene expression, selleck products malate efflux and Al3 + resistance. HvALMT, a barley malate transporter gene, on chromosome 2H is mainly expressed in stomatal guard cells and

expanding root cells [153]. When this gene was overexpressed in transgenic barley plants there was enhanced exudation of organic compounds and improved Al resistance. The efflux was validated to be independent of Al3 + [131]. Transcriptional approaches, such as transcriptional profiling, RT-PCR, RNAi, Northern blotting, and RNA sequencing [154] facilitated the identification of pathway-related genes and verification of gene function in Al tolerance. Northern analysis of ALS3, which was reported to encode an ABC transporter-like protein related to Al tolerance Bcl-2 inhibitor in Arabidopsis, revealed that gene expression occurred in all organs and expression

increased in roots treated with Al [155]. Chandran et al. [156] reported over 3000 genes by transcription profiling in an Al-sensitive Medicago truncatula cultivar under Al treatment. These genes were involved in cell wall modification, cell metabolism, protein synthesis and processing, and abiotic and biotic stress responses. RNA-induced silencing also proved that two of these genes, pectin acetylesterase and annexin, increased sensitivity to Al. Using a suppression subtractive hybridization technique, Chen et al. [157] identified 229 functional ESTs in the roots of Al-sensitive alfalfa cultivar YM1 after treatment with 5 μmol L− 1 Al stress. Of them, 137 were known Al-response genes, while the other 92 were novel genes potentially related to Al tolerance. The author also noticed that some novel Phospholipase D1 genes related to metabolism and energy were up-regulated and RT-PCR

validated the same result. Al is one of the most abundant metals in the earth’s crust and prevails in acid soils all over the world. Due to the increasing world population, there is an urgent need to ameliorate Al toxicity to increase plant production on acid soils. Although several approaches for adding exogenous chemicals have proved effective, breeding for tolerance seems to be the most promising. Over recent decades, molecular approaches have contributed greatly in unraveling genetic mechanisms. Although plants vary significantly in Al tolerance, it seems that they share common tolerance mechanisms. Many researchers have shown that an external mechanism, especially organic acid exudation, plays a major role in detoxifying Al.

Correspondingly, ultrasound shows a flattening of the nerve under

Correspondingly, ultrasound shows a flattening of the nerve under the arcade with a proximal swelling

in the sulcus. Cross-sectional areas greater than 0.1 cm2 accompanied by a hypoechoic appearance and loss of the honeycomb echotexture, are diagnostic for cubital tunnel syndrome. Another entity is caused by a repetitive subluxation or luxation of the nerve out of the sulcus leading to chronic pressure damage. Pictilisib A lacking or loose humeroulnar arcade is postulated as a reason for this. In the case of subluxation, the ulnar nerve is located at the tip of the medial epicondyle at maximum elbow flexion. In the case of luxation, it is dislocated volar to the medial epicondyle. The nerve dislocation is often accompanied by a nerve swelling [2]. Further, space-occupying lesions such as ganglia, lipomas, arthritic changes, accessory muscles, or a dislocation of the medial triceps head (“snapping triceps syndrome”) can be reliably identified. In these TGF-beta inhibitor cases, the compression is often located proximal to the cubital tunnel, which may result in atypical electrophysiological findings. The diagnostic value of sonography is comparable with electrophysiological methods, in combination it improves the diagnostic yield. In addition,

it provides prognostic information: the extent of swelling in the sulcus correlates negatively with clinical improvement after surgery [8]. Since the less common compression syndromes affect mostly smaller nerves, the sonographic depiction of a direct nerve compression is more difficult. Therefore, the main role of sonography lies in the recognition of neighborhood processes as compression factors. Thus, sonography can detect space-occupying lesions such as ganglia or lipomas affecting the ulnar nerve in Guyon’s Loge, the median nerve at the proximal forearm, the interosseous posterior

nerve in the supinator tunnel, the axillary nerve in the quadrilateral space as well as the suprascapular nerve. In the so-called algetic interosseus-posterior-syndrome Levetiracetam an ultrasound-guided infiltration can be performed for diagnostic purposes. In thoracic-outlet-sydrome, sonography can reveal a compression of the spinal nerve C7 or C8 by a cervical rib. In the lower extremities, peroneal nerve at the fibular head and tibial nerve in the tarsal tunnel can be affected by different soft tissue masses (enlarged bursae, ganglia, heterotopic ossification after trauma). Especially the peroneal nerve can be affected by intraneural ganglia emerging from tibiofibular joint via the articular branch [9]. In Morton’s metatarsalgia a “neuroma-like enlargment” of the second or third plantar interdigital nerve can be seen. Even in obese patients with meralgia paresthetica, a compression of the lateral femoral cutaneous nerve can be demonstrated and combined with an ultrasound-guided infiltration (personal experience).

These drugs were followed by first generation antiepileptics (FGA

These drugs were followed by first generation antiepileptics (FGAEs), such as carbamazepine and valproic acid (VPA), and later, by second generation antiepileptics (SGAEs), namely gabapentin and lamotrigine. Overdose of FGAEs has the potential of causing serious intoxication. Due to their narrow therapeutic windows, they may cause intoxications even at therapeutic doses. Acute toxicity caused by these drugs can be due to unintentional or suicidal intake, as well as to chronic use for therapy [1] and [2]. The purpose of this study was to assess the relevant epidemiological data,

to find which of the antiepileptics was the most frequent cause of intoxication, and to determine the neurological, Selleckchem RO4929097 cardiac, and biochemical problems caused by antiepileptics. Another purpose of the study was to assess in particular the correlation between the levels of carbamazepine and VPA JAK assay and the clinical picture in antileptic intoxications, and to compare the efficacies of different therapeutic approaches. In the Toxicology Unit of our Emergency Department, patients presenting with unintentional or suicidal poisoning are hospitalized and followed-up by

specialists and resident physicians of emergency medicine. This unit has intensive care beds for the follow-up of patients requiring mechanical ventilation. This retrospective study comprised 95 consecutive patients aged 18-year-old and older with antiepileptic intoxication, presenting to and being followed-up in our Toxicology Unit between January 2010 and February 2013. The data Ergoloid were obtained by reviewing the patient files. The patients were evaluated in terms of gender, age, the drugs they were exposed to

or took, the serum drug levels, the route and reason for taking the drugs (unintentional or suicidal), the clinical picture, the therapeutic methods applied, complications, the length of hospitalization, and mortality. In this retrospective study, the data were obtained by reviewing the patients’ files. The study included all patients between the ages of 18 and 80 with antiepileptic intoxication who had been hospitalized in the Toxicology Unit for at least 24 hours for examination and therapy. Statistical analysis was performed using SPSS v.15.0 for Windows. Both visual (histogram and probability graphs) and analytical (Kolmogorov-Smirnov and Shapiro-Wilk tests) methods were used to determine if the data was normally distributed. Descriptive variables are expressed as mean ± SD for data that is normally distributed and as median and interquartile range (IQR) for variables that are not normally distributed. Clinical and laboratory characteristics were evaluated via Mann-Whitney U test for variables without normal distribution. Patients were divided into three groups according to their level of drug. Comparison of these three groups by the Kruskal-Wallis test was used. When necessary, the Mann-Whitney U test with the Bonferroni correction was used to compare variables.

Performance in a standard battery of neuropsychological tests (Ta

Performance in a standard battery of neuropsychological tests (Table 1) revealed generally high functioning with no specific functional impairments. He showed above average Wechsler intelligence quotient (IQ) (The Psychological Corporation, 1999) and near-perfect performance on tests of everyday attention (Robertson, 2006), and the Visual Object and Space Perception Battery (Warrington and James, 1991),

with the sole exception of silhouette identification (19/30). Sentence repetition (Spreen and Benton, 1969), performed while the speaker’s face was hidden from view, was perfect and immediate. High resolution magnetic resonance imaging Selleckchem AG14699 (MRI) (500 μm3) revealed two lesions. Lesion 1 was located in superior mesencephalon, at the left anterio-medial tip of the subthalamic nucleus (11.5 mm left and 16.8 mm posterior to the anterior commisure). Total lesion volume was 42 mm3. Lesion 2 was located in mid-brainstem within the right dorso-medial pontine nucleus at the level of middle cerebellar peduncle around the exit of the trigeminal nerve (see Fig. 1). These were considered likely to represent small established lacunar infarcts. There was no evidence of an acute ischaemic lesion or LY2109761 in vitro microhaemorrhages. Diffusion tensor imaging (DTI) was undertaken using images from healthy subjects, to identify brain regions which are connected to the lesion sites (see Supplementary Methods

S1 and Supplementary Figure 1). Results indicated that lesion 1 had ipsilateral projections predominately into the

motor cortico-striato-pallido-thalamic-cortical relay loop, and a small projection with the Orbito-Frontal relay loop. Cortical projections were consistent with Limbic subthalamic nucleus (STN) (Lambert et al., 2012). Lesion 2 lay along the olivo-collicular pathway (Supplementary Figure 1), with largely ipsilateral projections to inferior colliculus and extending down to the medial territory of the peri-olivary nucleus. There was also a possible involvement of the tectopontine pathway. This second lesion may be associated with the early auditory system. Both regions have been implicated in crossmodal interactions (Halverson and Freeman, 2010; Kolomiets et al., 2001), and in event timing (Teki et al., 2011). Experiment 1 had 10 participants similar in age to PH (59–74 years, mean 65, standard deviation mafosfamide – SD 5). Experiment 2 had 27 neurologically healthy young subjects (18–28 years, mean 22), and included the results from the older age-matched controls. Data from four further participants were excluded, due to poor performance, resulting in implausible estimates of subjective timing >300 msec asynchrony, outside the typical range for multisensory integration (Vatakis et al., 2008; Vatakis and Spence, 2007) and indicative of poor quality data and unreliable function fits. Experiment 3 (testing the Stream–Bounce illusion) had 24 participants aged 18–24, excluding two others who reported no ‘bounce’ illusion.

Meki and Omar (1997) observed the same result on the effect of BK

Meki and Omar (1997) observed the same result on the effect of BK in the guinea-pig ileum using potentiators of BK (bradykinin potentiator B and BPP5a). Furthermore, we verified that S. cyanea whole venom-induced contractions LDK378 concentration of the guinea-pig ileum segments ( Fig. 3B), and this effect was potentiated by captopril ( Fig. 3D). These results indicate that bradykinin or analogues are probably

present in the venom of S. cyanea. Interestingly, Picolo et al. (2010) found that cyphokinin and Thr6-BK, bradykinin-related peptides isolated from the venom of the wasp C. fulvognathus were able to promote the contraction of guinea-pig ileum smooth muscle. However, this activity was not enhanced by captopril. They argued that only BK is a good substrate of ACE. This data reinforces our suspicion of the presence of BK in the venom of S. cyanea, as we observed potentiation of the effect of this venom by the presence of captopril. The present study demonstrated for the first time diverse pharmacological effects induced by S. cyanea wasp venom. Despite having a higher lethal dose than other wasp Epigenetics inhibitor venoms tested

so far, many behavioural and physiological changes were observed after venom injection in mice. A significant venom-induced rat hindpaw oedema was also showed, suggesting the presence, in S. cyanea venom, of histamine, serotonin, kinins and other molecules related to increased vascular permeability. Despite many previous studies, a slight hemorrhagic effect was observed in the Idoxuridine assay. Data obtained in the smooth muscle assay also suggest the presence of BK or analogues in S. cyanea whole venom. Antibacterial activity was also found, but the antibacterial molecules could be responsible for the haemolysis activity showed. Knowledge of symptoms and effects produced by S. cyanea venom has a primary role for health organizations, in order to improve clinical treatment in accidents caused by wasp stings. Moreover, because systemic effects induced are similar or lower than other social wasps and because of the positioning of the nest,

which is usually close to the bark of trees, this species can be a good choice for the introduction of crops infested by pests. The authors declare that there are no conflicts of interest. Financial support: FAPDF (193.000.418/2008), CNPq (303003/2009-0 to EFS, 479873/2008-9 to MRM). CDCG, TSC, and JAGV received scholarship from CNPq and CBFM, LLC, LAC, and FNO from CAPES. The authors greatly acknowledge “Laboratório Exame” (Brasília – DF, Brazil) for the kind gift of the bacteria strains used in this work. We thank the entomologist Dr. Fernando Barbosa Noll by identification of the wasp. “
“Nobuo Tamiya (Photo: J.M. Grognet). It was in the late 1960s when I first met Nobuo Tamiya. He came from Paris and was on his way to Japan, made a stopover in Frankfurt and visited our institute.

Carbohydrate ingestion has been associated with hypercalciuria, a

Carbohydrate ingestion has been associated with hypercalciuria, and sucrose ingestion has been found to be associated with urolithiasis.45 Phyate, a dietary factor found in many high fiber-containing foods (cereals, legumes, vegetables, and nuts), seems to bind calcium avidly and may inhibit the formation of calcium oxalate stones. Pharmacotherapy is recommended for children in whom fluid and dietary therapy is ineffective in controlling the formation of stones, or for those with primary hyperoxaluria, cystinuria, RG7204 or a known genetic condition associated with normocalcemic hypercalciuria (see

previous section on Genetic conditions associated with normocalcemic hypercalciuria). A thiazide diuretic is often required for children with hypercalciuria who do not respond to a restricted sodium Adriamycin molecular weight diet. The usual recommendation is hydrochlorothiazide 1 to 2 mg/kg/d (adult 25–100 mg/d). Amiloride can be added for its potassium-sparing effect as well as for its ability to independently reduce calcium excretion. Alternatively, potassium citrate could be provided to mitigate the effects of potassium depletion.

Thiazide diuretics have also been used in an attempt to reduce calcium excretion in patients with Dent disease, FHHNC, and PH. Treatment with either potassium citrate (2–4 mEq/kg/d, adults 30–90 mEq/d)48 or potassium-magnesium citrate49 has been shown to reduce the recurrence of calcium oxalate stone formation in patients with low or normal citrate excretion. Sodium citrate is generally considered less ideal because it is associated with increased sodium delivery to the nephron. Treatment is considered safe with only minor gastrointestinal side effects; however, one potential

concern is that over-treatment with alkali may increase the risk of calcium phosphate stone formation Sclareol by increasing the urinary pH to greater than 6.5, thereby decreasing the calcium phosphate supersaturation product. Potassium citrate is also used to alkalinize the urine in patients with Dent disease, FHHNC, dRTA, uric acid lithiasis (goal of urine pH >6.5), cystinuria (goal of urine pH >7), and hyperoxaluria. These agents are used exclusively for patients with cystinuria in whom fluid and dietary modifications as well as urinary alkalinization are ineffective in preventing stone recurrences or dissolving preexisting stones. The 2 most common agents are d-penicillamine and α-mercaptopropionylglycine (tiopronin). Cystine is formed as a dimer of cysteine and these agents work by reducing the disulfide bond that bridges the 2 molecules of cysteine. The thiol group combines with cysteine to form a more soluble cysteine-drug product combination, which is be excreted.

, 2013) and polymorphisms in human relaxin-3 and RXFP3 associated

, 2013) and polymorphisms in human relaxin-3 and RXFP3 associated with metabolic disturbances in patients with schizophrenia treated with antipsychotic drugs (Munro et al., 2012). Thus the study of the NI and relaxin-3 is an exciting new frontier in behavioural neuroscience. A strategy to achieve potent and selective lesioning of target brain structures has been to utilise cell-surface protein binding peptides or antibodies conjugated with saporin, a monomeric ribosomal inactivating protein (Heckers et al., 1994, Li et al., 2008, Thorpe et al., 1985 and Waite et al., 1994). Selectivity is achieved

because, as a ribosomal toxin, the saporin is only toxic when internalised by the corresponding receptor. The corticotropin releasing factor (CRF)–saporin conjugate Alectinib concentration toxin, used in the present study, is expected to selectively ablate CRF1 expressing cells (Hummel et al., 2010 and Maciejewski-Lenoir et al., 2000). On the premise that relaxin-3 expressing neurons in the NI predominantly co-express CRF1 receptors (Tanaka et al., 2005), the present investigation attempted to establish a method for selective ablation of the NI using the CRF–saporin conjugate. Out of the total of 76 rats that underwent the surgical procedure, 43 receiving CRF–saporin and 33 serving as various controls, no mortality attributable to the CRF–saporin

lesion was observed. Two rats were euthanised under veterinary advice because of an unrelated infection and a case of malocclusion of the incisors. In one experiment, post-surgical weight gain was monitored daily Gemcitabine cell line over 14 days but there was no significant difference in weight gain Selleckchem Stem Cell Compound Library between the sham- and NI-lesioned rats (n=8 per group, n.s.). To determine an appropriate dose of CRF–saporin, 40×, 20× and 10× dilutions of the original stock solution of CRF–saporin were infused separately into the NI of rats. CRF1 immunofluorescence staining results showed that infusion of 172 ng of CRF–saporin was sufficient to bring about a loss in CRF1 expressing cells in the NI (Fig. 1A–D). This dose is therefore used for the subsequent experiments. The specificity

of the CRF RI/II antibody was assessed by preabsorption of the antibody with the CRF blocking peptide, which abolished CRF1 staining in the NI of naïve rats (Fig. 2A–B). RT-PCR analysis showed that the NI-lesioned rats had a significant reduction in the expression of CRF1 receptors compared to the sham-lesioned group. As hypothesised, corresponding decreases in the expression of relaxin-3 and GAD65 were also observed in the NI-lesioned rats (Fig. 3A). TPH2 expression was unaltered in both the sham and NI-lesioned group as seen in the densitometry analysis of the PCR bands (Fig. 3B). In a separate group of animals, a real-time PCR analysis showed that the CRF1, relaxin-3 and GAD65 mRNA expression in NI-lesioned rats was 0.004-, 0.02- and 0.

Owing to the finite resolution of the wave model, there is always

Owing to the finite resolution of the wave model, there is always a certain difference between the location Buparlisib cell line of an observation or measurement site and the nearest grid point for which the wave properties are calculated. This difference is an intrinsic source of deviations between modelled and measured/observed wave data.

The match of the basic statistics of numerically simulated wave conditions with those observed at different sites is, however, quite good except for some coastal locations (Räämet et al. 2009, 2010, Zaitseva-Pärnaste et al. 2009, Räämet & Soomere 2010a). Weekly variations in observed wave heights. The observed data sets contain several gaps for different reasons (Soomere & Zaitseva 2007, Soomere et al. 2011). These gaps are distributed unevenly over the years. Therefore, their presence may affect the estimated course of seasonal and even interannual variations in the wave properties. In order to suppress their influence,

Soomere et al. (2011) made an attempt to replace the missing observations by the relevant climatological mean values for wave heights for single calendar days1. These values, calculated for each calendar day over 55 years at Vilsandi and Narva-Jõesuu and over 31 years at Pakri, contain some noise, the level of which is the largest for the season with a selleck relatively small number of measurements (Figure 3). The resulting values show several interesting variations in wave intensity in weekly scales, a part of which are synchronous at all three sites. The most impressive short-time feature in the wave activity is the relatively calm period at the end of December and the beginning of January. It is well pronounced in the Vilsandi and Pakri data, and somewhat less evident at Narva-Jõesuu. Shorter time periods with noticeably larger wave intensity occur at all sites during the first week PAK5 of August, in the middle of September, at the end of October and at the beginning of December. Their presence suggests that there might exist quite a strong intraseasonal variability in weather conditions in the north-eastern Baltic Sea region.

The spatial extension of this variability is large enough to create a footprint in the wave intensity from the Baltic Proper to the south-eastern part of the Gulf of Finland. A minor feature, probably created by strong easterly winds specific to the Gulf of Finland (Soomere & Keevallik 2003), is the relatively large wave intensity at Pakri in some weeks of April/May and at the end of June. Seasonal variations in observed, measured and simulated wave heights. The presence of a strong seasonal course in the wave heights in the entire Baltic Sea region is a well-known feature that stems from the similar course in the wind speed (Rzheplinski 1965, Rzheplinski & Brekhovskikh 1967, Kahma et al. 1983, Launiainen & Laurila 1984, Mårtenson & Bergdahl 1987, Kahma & Pettersson 1993, Pettersson 1994, 2001, Mietus (ed.) 1998, Jönsson et al. 2002, Kahma et al. 2003).

, 1994 and Frontalini et al , 2009) and it tends to reduce divers

, 1994 and Frontalini et al., 2009) and it tends to reduce diversity ( Supplementary Table 4). Trace metals in high concentrations tend to cause a physiological disturbance in the growth of foraminifera ( Samir and El-Din, 2001) and also appears to interfere with the uptake of Ca forming weaker tests ( Yanko et al., 1994). That said, no

samples recovered here were devoid of Foraminifera as has been noted in areas with extreme levels of metal pollution elsewhere ( Scott et al., 2001 and Ferraro et al., 2006), although some SHB stations did have very low numbers of specimens. These results suggest that while the levels of trace metals in both locations are generally tolerable for Foraminifera, some localized effects, particularly in SHB may be occurring. The observations presented here are the first for extant benthic Foraminifera from along the west coast of South Africa, http://www.selleckchem.com/products/BKM-120.html and more particularly relating their community structure to point source pollution and they represent a useful baseline

against which other studies can be measured. Richness is higher than observed elsewhere in Africa (Murray, 2007) but this is likely a reflection of a paucity of data from elsewhere on the continent. There were pronounced differences between Dasatinib supplier the assemblages recovered in the two study locations, which may reflect biogeography as well as differences in the nature and volume of the effluent being dumped at each site, the duration of system exposure to effluent and the respective circulation patterns. That said, as in other studies, assemblages overall show a high level of variability reflecting small scale differences in the psammal environment, and they are strongly influenced by heavy metal concentrations. The dominance of assemblages in SHB by Ammonia, Elphidium and Bolivinids and the absence of Miliolids is indicative of a stressed environment

as assemblages are dominated by what are mostly opportunistic species. Whilst many of the results shown here are in agreement with published findings, they demonstrate that regional Cediranib (AZD2171) generalisations about environmental responses of assemblages to the environment can only really be generated from a regional, and not local, dataset. The authors would like to thank the National Research Foundation (SA) for financial support during this study. We would also like to thank Dr. M. Hendricks, Mr. L. Cyster and Dr. B. Julies for technical support and the University of the Western Cape for the use of their facilities. We would like to thank the editor and the anonymous reviewers for their useful comments which have improved the text of the manuscript. “
“Scientific concern for the health of our coastal marine environments against a background of anthropogenic pressures and global climate change is wide spread (Grech et al., 2012, Hoegh-Guldberg et al., 2007 and Waycott et al., 2009).

It is clear

from the PCA analysis that by month 7, the ba

It is clear

from the PCA analysis that by month 7, the bacterial community structure was primarily affected by the planting regime and communities were separated out according to the presence of roots, AM fungi, or whether the soil was left bare; dilution was unimportant at that stage. The fungal communities were relatively unaffected by mycorrhizal status of the plants by month 7, but PCA differentiated between the dilution treatments in the bare soil. AM fungal colonisation resulted in increased aggregate selleck screening library stability relative to NM planted and bare soil treatments as would be expected and this was most noticeable in soils amended with the 10−1 dilution and also in months 3 and 5. AMF are known to improve aggregate stability as a result of glomalin production (Wright and Upadhyaya, 1998, Wright and Anderson, 2000, Rillig and Steinberg, 2002 and Rillig et al., 2002) and/or by the action of extraradical hyphae that enmesh and physically bind soil particles

(Tisdall and Oades, 1982 and Bearden and Petersen, 2000). Piotrowski et al. (2004) demonstrated that aggregate stability varies with fungal-plant combination; the mycorrhizal inoculum used in this investigation was a mixed species inoculum since field plants will be subjected to more than one species. It is interesting that aggregate stability click here was no different in NM planted than in bare soils amended with the 10−1 dilution despite microbial biomass-C being significantly

greater in Atazanavir NM plants from month 3 onwards. In pot experiments it is possible for roots to negatively affect aggregate stability because of high root densities; however in this investigation, aggregate stability was similar in the bare and NM soils at early harvests, before roots reached their maximum density. This suggests that aggregate stability was influenced by factors other than microbial biomass or root size per se. The pots were not visibly ‘root bound’ at the end of the experiment and this observation is supported by the aggregate stability and porosity data. The total porosity was similar between months 5 and 7 but would be expected to decrease in month 7 if roots had reached a deleterious mass, as all root material was classified as soil as opposed to pore space during image analysis. General linear regressions were conducted to determine relationships between the biological parameters and MWD; terms included in the optimum model were bacterial TRF richness, microbial biomass-C and root dry weight. The negative relationships observed between both root dry weight and microbial biomass-C with aggregate stability were not anticipated. Root systems are usually considered as binding agents in soils as a result of the effects of their penetration and expansion (Tisdall and Oades, 1982). Hallett et al.