Reference limits for blood gas analysis performed from coccygeal vessels of multiparous Holstein dairy cows: Effects of stage of lactation and season of sampling.

Blood gas analysis is a great support to the diagnostic process of critically ill patients. Its correct application to the medicine of dairy cows depends on the availability of specific reference intervals that are still difficult to find in the literature. They may vary according to the type of blood sampled, animals' age and production stage, and climatic conditions. This study aimed at calculating the reference limits for some blood gas parameters in the blood collected from the coccygeal vessels of multiparous Holstein dairy cows. This site of sampling implies the risk of withdrawing blood of unknown origin (venous, arterial, or mixed), but has a high practical interest for the easy and quick performance and the minimal animal restraint required. Data from 379 cows were used, and reference limits were produced for pH, partial pressure of carbon dioxide (pCO2), bicarbonate concentration (HCO3), total carbon dioxide concentration (tCO2), oxygen saturation (sO2), hemoglobin (Hb), hematocrit (Hct), base excess (BE), glucose, Na, K, and ionized calcium (iCa). The effects of stage of lactation (5 to 60 vs. > 60 DIM) and season of sampling (cold vs. hot) were investigated, and specific reference limits were produced for each variable and each level of the factors whenever a significant effect was detected. The pH, sO2, K, and iCa were not influenced by season or stage of lactation. All the other blood gas parameters were significantly affected by season of sampling, and Hb, Hct, glucose, and Na were also affected by stage of lactation. Reference limits provided in this study are specific to the site of sampling (coccygeal vessels) and the animal category considered. Further studies are needed to produce reference intervals for other blood gas parameters, cow categories, and blood types.

From paper to informatics: the Post Soft Care-App, an easy-to-use and fast tool to help therapists identify unmet needs in stroke patients.

Even after rehabilitation, post stroke patients remain disabled. The Post Stroke Checklist (PSC) was developed to highlight unmet needs of community-dwelling stroke patients. The present study set out to validate Post Soft Care-App, designed to administer the PSC using smartphones and tablets, in order to monitor unmet needs in chronic patients. Fifty-three patients and fifteen physiotherapists were enrolled. The therapists administered the PSC to patients using the app, and then completed a structured questionnaire on its usability and utility. The Post Soft Care-App highlighted the following unmet needs: increased spasticity (56.6%), reduced independence in activities of daily living (47.2%), reduced mobility (45.3%), absence of secondary prevention (45.3%). Therapists positively evaluated Post Soft Care-App as useful, practical, quick to complete (96.2%), and effective in helping improve communication with patients (75.5%). The Post Soft Care-App can be considered a valid assessment tool for helping therapists to monitor functional outcomes in chronic patients.

An enthalpic component in cooperativity: the relationship between enthalpy, entropy, and noncovalent structure in weak associations.

Attempts to quantify binding interactions of noncovalent complexes in aqueous solution have been stymied by complications arising from enthalpy-entropy compensation and cooperativity. We have extended work detailing the relationship between noncovalent structure and free energy of binding to include the roles of enthalpy and entropy of association. On the basis of van't Hoff measurements of the dimerization of vancomycin type antibiotics, we demonstrate that positive cooperativity manifests itself in a more favorable enthalpy of association and a partially compensating less favorable entropy of association. Finally, we extend these results to rationalize thermodynamic observations in unrelated systems.

Xrcc3 is required for assembly of Rad51 complexes in vivo.

Rad51 is a member of a family of eukaryotic proteins related to the bacterial recombinational repair protein RecA. Rad51 protein localizes to multiple subnuclear foci in Chinese hamster ovary cells. Subnuclear Rad51 foci are induced by ionizing radiation or the DNA cross-linking agent cisplatin. Formation of these foci is likely to reflect assembly of a multimeric form of Rad51 that promotes DNA repair. Formation of damage-induced Rad51 foci does not occur in the Chinese hamster ovary cell line irs1SF, which is sensitive to DNA damaging agents. The Rad51 focus formation defect of irs1SF cells is corrected by a construct that encodes the repair protein Xrcc3. Xrcc3 is a human homolog of Rad51 previously isolated by virtue of its ability to correct the radiation sensitivity of irs1SF cells. Changes in the steady state level of Rad51 protein do not account for the irs1SF defect nor do they account for the appearance of foci following DNA damage. These results suggest that Xrcc3 is required for the assembly or stabilization of a multimeric form of Rad51 during DNA repair. Cell lines defective in two different components of DNA protein kinase formed Rad51 foci in response to damage, indicating DNA protein kinase is not required for damaged-induced mobilization of Rad51.

Variant translocation t(6;10)(p21;q22) in pulmonary chondroid hamartoma.

Banding cytogenetics and fluorescence in situ hybridization analysis of a pulmonary chondroid hamartoma (PHC) showed the presence of a t(6;10)(p21;q22). A cytogenetically identical translocation has previously been found in another case of PHC, suggesting that it could represent a variant form of the standard t(6;14)(p21;q24).

Is the preconditioning response conserved in senescent myocardium?

BACKGROUND: Senescent myocardium differs from adult myocardium at both functional and cellular levels. To adjudicate the efficacy of ischemic preconditioning as an alternative or adjuvant myoprotective strategy a reproducible, age-independent, intact laboratory model is necessary. METHODS: Adult (0.5 to 1.0 years) and senescent (5.7 to 8.0 years) sheep underwent 60 minutes of normothermic regional ischemia with 150 minutes of reperfusion. Group II (adult-ischemic preconditioning) and group IV (aged-ischemic preconditioning) underwent preconditioning with three 5-minute episodes of normothermic regional ischemia. Group I (adult-control) and group III (aged-control) were not preconditioned. RESULTS: Risk size and infarct size weights were delineated by monastryl blue pigment infusion and buffered tetrazolium solution. Ischemic preconditioning was evidenced by an infarct size reduction of 54% for adult sheep and 47% for senescent sheep (p < 0.01 versus age-matched controls; p = not significant for adult versus senescent). CONCLUSIONS: The data suggest that the cellular pathways involved with the preconditioning response are well preserved in senescent myocardium and support the utility of the ovine heart model to investigate the clinical relevance of ischemic preconditioning for the increasingly aged population presently undergoing cardiac operations.

Cytogenetic and molecular genetic characterization of papillary thyroid carcinomas.

A combined cytogenetic and molecular analysis was performed on 11 cases of papillary thyroid carcinoma. A simple karyotypic abnormality was detected in five tumors, whereas six had no apparent chromosome change. In four of five rearranged cases the presence of a specific chromosomal abnormality involving chromosome 10 (cases 1 and 2) and chromosome 1 (cases 3 and 4) was associated with the rearrangement of two protooncogenes: RET and NTRKI (formerly trk), respectively, with different donor genes. Moreover, the chromosomal localization of the involved genes and the type of chromosomal change observed suggested that RET and NTRKI activation occurred by intrachromosomal rearrangements. The six cases with normal karyotype did not show RET or NTRKI activation. These findings suggest that a combined cytogenetic and molecular approach would be useful in understanding the pathogenesis of thyroid neoplasia.

Cytogenetic abnormalities and overexpression of receptors for growth factors in normal bronchial epithelium and tumor samples of lung cancer patients.

A cytogenetic analysis was performed on direct preparations and short-term cell cultures of lung tumor and normal bronchial epithelium of 19 patients carrying either a first or a second primary lung cancer. In 9 tumors (6 squamous cell carcinomas, 1 adenocarcinoma, 1 mucoepidermoid carcinoma, and 1 small cell lung carcinoma) successfully analyzed, pseudodiploid and hyperdiploid karyotypes were observed with a heterogeneous pattern of chromosome abnormalities but with a consistent involvement (5 cases) of the short or the long arm of chromosome 3. The normal bronchial epithelial cells had a normal karyotype in 11 patients, whereas in 6 patients clonal and nonclonal chromosomal abnormalities were observed. Involvement of chromosome 7 was present in 4 cases. In addition, overexpression of the growth factor receptors, epidermal growth factor receptor and HER-2/neu, was found in 9 of 18 tumors and in 6 of 13 bronchial epithelium samples. These findings suggest that early genetic lesions could be present in the normal bronchial epithelial cells that are the target of further complex and multiple genetic changes occurring during the pathogenesis of lung cancer.

Involvement of the region 13q14 in a patient with adamantinoma of the long bones.

A cytogenetic analysis of a lung metastasis of an adamantinoma of the tibia, a rare tumor of the long bones, revealed a karyotype 52, XY, t(7;13)(q32;q14), +7, +12, +13, +19, +der(7) t(7;13), +der(13) t(7;13). The t(7;13) was found to be constitutional in the patient and was also present in peripheral blood lymphocytes of his unaffected father. However, both subjects displayed normal levels of esterase D enzyme activity.

t(11;22) in three cases of peripheral neuroepithelioma.

Short-term cultures of three cases of peripheral neuroepitheliomas were studied using G-banding technique. A t(11;22)(q24;q12) was recognized in all three tumors. The results strengthen the hypothesis of a common histogenesis for neuroepithelioma, Ewing's sarcoma, and the Askin tumor.

Cytogenetic study in therapy-related myelodysplastic syndromes (t-MDS) and acute non-lymphocytic leukaemia (t-ANLL).

A cytogenetic study was performed in 27 patients suspected of t-MDS or t-ANLL. In 12 patients the diagnosis of t-MDS or t-ANLL was confirmed by morphological, cytochemical and immunophenotypical analysis. The cases were classified as RA (one), RAEB (four), CMML (two), ANLL (five). They had received chemotherapy and/or RT for Hodgkin's disease (eight cases), solid tumours (three cases) and multiple myeloma (one case). Clonal chromosome abnormalities were found in bone marrow or peripheral blood cells in all the 12 cases. Five patients had a clonal abnormality of chromosome no. 5 (monosomy, deletions, translocation and inversion of 5q). The critical region on chromosome no. 5 comprised bands q12-q34. Monosomy and deletion of chromosome 7q was observed in the other two patients. In the six remaining patients various karyotypic patterns were observed including a t(4;11) (q21;q23) in one case, monosomies (four cases) and trisomies (one case) of different chromosomes. In the other 15 cases, the presence of a normal karyotype together with the morphological and immunophenotypical characterisation was consistent with a diagnosis of non-neoplastic specimens.

Chromosome abnormalities and fragile sites in human melanoma.

Chromosome analysis in short-term lines of three primary and seven metastatic malignant melanomas showed aneuploid karyotypes with recurrent abnormalities of chromosomes 1 (five cell lines), 6 (nine cell lines), and 7 (six cell lines). The breakpoints observed on the rearranged chromosomes frequently coincided with loci of known oncogenes and fragile sites. Two of the cell lines were analyzed after xenograft into nude mice and showed the presence of the same chromosomal changes observed in the parental cell lines, indicating the stability of the karyotype. A tendency toward an increased chromosomal fragility in peripheral blood lymphocytes was observed in five melanoma patients compared to ten normal individuals. However, there was no increased level of expression of specific fragile sites corresponding to the breakpoints observed in melanoma cells.