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Objective: to compare results of ultrasound examination (US) of the wrist joints (WJ) and small joints of hands with the clinical signs in patients with early rheumatoid arthritis (eRA) and hand osteoarthriti (OAH).Patients and methods. The study included 42 patients with eRA (group 1) and 38 patients with OAH (group 2). The average age of patients with eRA was 48.60±14.86 years, the duration of clinical manifestations was 7.45±1.77 months, of patients with OAH – 54.97±12.45 years and 8.26±1.83 months, respectively. The ratio of men and women in both groups was approximately the same, the majority were women. All patients with eRA had clinical and instrumentally confirmed signs of OA: I, II, and III radiological stages of OA according to Kellgren–Lawrence were detected in 10 (23.80%), 23 (54.76%) and 9 (21.43%) patients respectively. In erosive OA II and III X-ray stage was diagnosed in 16 (42.10%) and 22 (57.90%) patients, respectively. All patients underwent ultrasound of the joints, as well as a general clinical examination, which included an assessment of the number of painful joints, the number of swollen joints, and a general assessment of pain intensity using a visual analogue scale (100 mm). RA activity was determined using the DAS28 index. We also studied laboratory parameters – the levels of CRP, rheumatoid factor and antibodies to cyclic citrullinated peptide in blood serum.Results and discussion. Comparison of the two groups of patients showed that ultrasound in B-mode and power Doppler mode with eRA and OAH showed more pronounced inflammatory and destructive changes in the wrist joints and small joints of the hands, with the exception of the distal interphalangeal joints (DIPJ). In addition, only in patients of the 1st group there was a close correlation between the enhancement of the Doppler signal and levels of inflammatory markers. Conclusion. eRA compared with OAH is characterized by more pronounced ultrasound signs of inflammatory and destructive changes in the wrist joins and small joints of the hands, with the exception of DIPJ.

B orgy B, G aba S, P etit S & R eboud X (2012) Non-random distribution of weed species abundance in arable fields. Weed Research 52, 383-389. Summary Many decisions for pest control in agriculture are based on densities, rather than species presence only. Little is known about the distribution of pest abundance and even less when several species present in a field may interact. With the aim of developing an ecologically based approach to weed management, we compared observed co-occurrence patterns with a null model, to test whether the abundances of weed species were randomly assembled. The data set covered the pattern of co-occurrence of abundances of weeds within 200-m2 plots located in 1143 arable fields scattered across France. Our results pinpointed a highly significant 'similar attraction-dissimilar repulsion' rule, as species reaching similar abundance levels co-occurred significantly more often than expected under the hypothesis of a random distribution of abundance. A similar analysis applied to the 25% plots that had the highest weed densities indicated that the 'similar attraction-dissimilar repulsion' rule held true for low-abundance classes, but not in situations where at least one species was observed at densities above 20 individuals m−2. Our analysis extends the analysis of community beyond the sole species richness index by accounting for their abundance. Overall, weed species interfered or responded similarly to an external biotic or abiotic factor, with resulting adjustment of densities at the scale of the agricultural field. [ABSTRACT FROM AUTHOR]