Bargaining for health: A case study of a collective agreement-based health program for manual workers

This paper examines the short- and medium-term effects of the PensionDanmark Health Scheme, the largest privately administered health program for workers in Denmark, which provides prevention and early management of work-related injuries. We use a difference-in-differences approach that exploits a natural variation in the program rollout across collective agreement areas in the construction sector and over time. The results show only little evidence of an effect on the prevention of injuries requiring medical attention in the first 3 years after the program was introduced. Despite this, we find evidence of significant positive effects on several labor market outcomes, suggesting that the program enables some work-injured individuals to maintain their work and earnings capacity. In view of its low costs, the program appears to be cost-effective overall.     

Relationship between blood cadmium,lead, and serum thyroid measures in US adults – the National Health and Nutrition Examination Survey (NHANES) 2007–2010

Experimental studies have shown that both cadmium (Cd) and lead have potent endocrine disrupting activity. However, studies on whether these heavy metals disrupt thyroid system in humans, especially in general populations with low levels of exposure, are sparse. The study analyzed 6,231 participants aged 20 and older with measurements from 2007–2010 of the National Health and Nutrition Examination Survey (NHANES) to investigate whether whole blood Cd and lead level are associated with serum thyroid hormones measures. Our study suggests that thyroid function may be disrupted by both Cd and lead exposures in the general population and the specific roles of Cd and lead exposure on thyroid axis may differ by sex. However, the mechanisms by which these heavy metals may disrupt thyroid system function in general population needs to be further investigated.     

不同产地厚朴中重金属及有害元素检测

目的:检测不同产地厚朴中重金属及有害元素含量。方法:采用原子荧光光度法和原子吸收分光光度法对全国8省11个不同产地厚朴中铅、镉、砷、汞、铜进行测定。结果:不同产地厚朴中所含重金属及有害元素的量有一定差异,11个样品中除有4个样品的铅含量较高外,其余均符合"药用植物及制剂外经贸绿色行业标准"要求。结论:所建立的方法可行,其含量测定结果可为厚朴药材的规范化种植和质量评价提供参考。     

Assessment of naturally occurring covalent and total dimer levels in human IgG1 and IgG2

Antibody dimers, two self-associated monomers, have been detected on both recombinantly expressed and endogenous human IgG proteins. Nearly 10 years ago, Yoo et al. (2003) described low levels of IgG2 covalent dimer, in human serum, but did not quantify the levels. Here we quantify the total and covalent dimer levels of IgG2 and IgG1 in human blood, and study the origin of covalent dimer formation. Low levels (<1%) of total IgG1 and IgG2 dimers were measured in freshly prepared human plasma. Both IgG1 and IgG2 covalent dimers were also found in plasma. Whereas IgG1 covalent dimer levels were significantly reduced by steps intended to eliminate artifacts during sample preparation, IgG2 covalent dimer levels remain stable in such conditions. About 0.4% of IgG2 in plasma was in a covalent dimer form, yet very little (<0.03%) of IgG1 covalent dimer could be considered naturally occurring. IgG2 dimer also formed in vitro under conditions designed to mimic those in blood, suggesting that formation occurs in vivo during circulation. Thus, small amounts of covalent IgG2 dimer do appear to form naturally.     

The analysis of VH and VL genes repertoires of Fab library built from peripheral B cells of human rabies virus vaccinated donors

A human combinatorial Fab antibody library was generated from immune repertoire based on peripheral B cells of ten rabies virus vaccinated donors. The analysis of random Fab fragments from the unselected library presented some bias of V gene usage towards IGHV-genes and IGLV-gen families. The screening of the Fab library on rabies virus allowed specific human Fab antibody fragments characterized for their gene encoding sequences, binding and specificities to RV. Genetic analysis of selected Fabs indicated that the IGHV and IGLV differ from the germ-line sequence. At the level of nucleotide sequences, the IGHV and IGLV domains were found to share 74–92% and 90–96% homology with sequences encoded by the corresponding human germ-line genes respectively. IGHV domains are characterized most frequently by IGHV3 genes, and large proportions of the anti-RV heavy chain IGHV domains are obtained following a VDJ recombination process that uses IGHD3, IGHD2, IGHD1 and IGHD6 genes. IGHJ3 and IGHJ4 genes are predominantly used in RV-Fab. The IGLV domains are dominated by IGKV1, IGLV1 and IGLV3 genes. Numerous somatic hypermutations in the RV-specific IGHV are detected, but only limited amino acid replacement in most of the RV-specific IGLV particularly in those encoded by J proximal IGLV or IGKV genes are found. Furthermore, IGHV3–IGKV1, IGHV3–IGVL1, and IGHV3–IGLV3 germ-line family pairings are preferentially enriched after the screening on rabies virus.     

Sealer Penetration into Dentinal Tubules in the Presence or Absence of Smear Layer: A Confocal Laser Scanning Microscopic Study

Introduction

The aim of this study was to test the dentinal tubule penetration of AH26 (Dentsply DeTrey, Konstanz, Germany) and MTA Fillapex (Angelus, Londrina, PR, Brazil) in instrumented root canals obturated by using cold lateral compaction or warm vertical compaction techniques in either the presence or absence of the smear layer.

Methods

Forty-five extracted single-rooted human mandibular premolar teeth were used. The crowns were removed, and the root canals were instrumented by using the Self-Adjusting File (ReDent-Nova, Ra'anana, Israel) with continuous sodium hypochlorite (2.6%) irrigation. Final irrigation was either with 5% EDTA or with sodium hypochlorite. The canals were dried and obturated by using rhodamine B–labeled AH26 or MTA Fillapex in combination with the cold lateral compaction or the warm vertical compaction technique. After setting, the roots were sectioned horizontally at 4-, 8-, and 12-mm distances from the apical tip. On each section, sealer penetration in the dentinal tubules was measured by using confocal laser scanning microscopy.

Results

Regardless of the usage of EDTA, MTA Fillapex, compared with AH26, was associated with greater sealer penetration when used with the cold lateral compaction technique, and, conversely, AH26, compared with MTA Fillapex, was associated with greater sealer penetration when used with the warm vertical compaction technique (P < .05). Removal of the smear layer increased the penetration depth of MTA Fillapex used with the cold lateral compaction technique (P < .05); however, it had no significant effect on the penetration depth of AH26.

Conclusions

Greater sealer penetration could be achieved with either the MTA Fillapex–cold lateral compaction combination or with the AH26–warm vertical compaction combination. Smear layer removal was critical for the penetration of MTA Fillapex; however, the same did not hold for AH26.