A numerical model of birch pollen emission and dispersion in the atmosphere. Description of the emission module.

A birch pollen emission model is described and its main features are discussed. The development of the model is based on a double-threshold temperature sum model that describes the propagation of the flowering season and naturally links to the thermal time models to predict the onset and duration of flowering. For the flowering season, the emission model considers ambient humidity and precipitation rate, both of which suppress the pollen release, as well as wind speed and turbulence intensity, which promote it. These dependencies are qualitatively evaluated using the aerobiological observations. Reflecting the probabilistic character of the flowering of an individual tree in a population, the model introduces relaxation functions at the start and end of the season. The physical basis of the suggested birch pollen emission model is compared with another comprehensive emission module reported in literature. The emission model has been implemented in the SILAM dispersion modelling system, the results of which are evaluated in a companion paper.

Towards numerical forecasting of long-range air transport of birch pollen: theoretical considerations and a feasibility study.

This paper considers the feasibility of numerical simulation of large-scale atmospheric transport of allergenic pollen. It is shown that at least small grains, such as birch pollen, can stay in the air for a few days, which leads to a characteristic scale for their transport of approximately 10(3) km. The analytical consideration confirmed the applicability of existing dispersion models to the pollen transport task and provided some reference parameterizations of the key processes, including dry and wet deposition. The results were applied to the Finnish Emergency Dispersion Modelling System (SILAM), which was then used to analyze pollen transport to Finland during spring time in 2002-2004. Solutions of the inverse problems (source apportionment) showed that the main source areas, from which the birch flowering can affect Finnish territory, are the Baltic States, Russia, Germany, Poland, and Sweden-depending on the particular meteorological situation. Actual forecasting of pollen dispersion required a birch forest map of Europe and a unified European model for birch flowering, both of which were nonexistent before this study. A map was compiled from the national forest inventories of Western Europe and satellite images of broadleaf forests. The flowering model was based on the mean climatological dates for the onset of birch forests rather than conditions of any specific year. Utilization of probability forecasting somewhat alleviated the problem, but the development of a European-wide flowering model remains the main obstacle for real-time forecasting of large-scale pollen distribution.

Radiographic assessment of dental health in middle-aged men following sudden cardiac death.

Poor oral health has been suggested to be a risk factor for myocardial infarction. To study if dental pathology might predispose to pre-hospital sudden cardiac death, and using a sum index of panoramic tomography findings, we compared the oral health of middle-aged (33-69 yrs) male victims (Helsinki Sudden Death Study) of sudden cardiac death (n = 117) with that of controls, who died of non-cardiac diseases (n = 63) or suffered unnatural sudden death (n = 120). The mean number of teeth was 15.2, and 17.4% of the men were edentulous. Frequent age-associated findings in dentate victims were fillings (79.9%), horizontal bone loss (72.1%), periapical lesions (45.6%), residual roots (38.2%), and vertical pockets (30.9%). In multivariate analysis with coronary heart disease risk factors and number of teeth as covariates, poor oral health was associated (p = 0.053) with the risk of sudden cardiac death along with age, smoking, and body mass index. This association was especially strong (p = 0.009) among victims < 50 yrs.

Does the triad of fungi, bacteria and exposure to moisture have an impact on chronic hyperplastic sinusitis?

UNLABELLED: Here we evaluated a possible relationship between chronic hyperplastic sinusitis (CHS) and moisture exposure and secondly a seasonal variation of fungal and bacterial findings in the healthy nose. In 28 CHS patients sinus mucus was collected during endoscopic sinus surgery. Samples from the nasal cavities of 19 healthy volunteers were collected by nasal lavage (NAL) in January and in September. Bacterial culture and fungal staining and culture were carried out. Histological samples from the sinus mucosa were obtained. Patients' medical history and environmental factors were enquired. Mold odor or moisture problems in the home or work environment were reported by 46% of the CHS patients. Patients who reported moisture exposure did not differ significantly from those who had not been exposed with regards to microbiological findings, tissue eosinophilia, and earlier operations. Cladosporium (16%) and Alternaria (11%) were found in NAL fluid collected in the autumn from the control subjects. No fungi were isolated from samples taken during the winter. An association between CHS or fungal sinusitis and moisture damage was not apparent in the present study. The fungal findings in the nasal cavity reflect the environmental exposure. This should be taken into account when NAL is used for microbiological studies. PRACTICAL IMPLICATIONS: Living in a moldy house or working in a similar environment may increase the risk of respiratory symptoms and infections. However, our results suggest that chronic hyperplastic sinusitis and fungal sinusitis are not associated with moisture exposure. The nose is a good collector of particles in the air. Especially samples taken by the nasal lavage method reflect the environmental exposure. This should be taken into account when this method is used for microbiological studies.

International collaboration in mass disasters involving foreign nationals within the EU: medico-legal investigation of Finnish victims of the Milan Linate airport SAS SK 686 aircraft accident on 8 October 2001.

Identification of and investigation into the cause of death of foreign nationals in mass disasters are generally conducted according to the jurisdiction of the country in which the disaster occurs. However, such identification can be achieved only through co-operation with the authorities of the victims' countries of residence. On October 8th 2001 at Linate airport in Milan, Italy, an MD87 SAS airplane with 110 crew members and passengers on board collided on the ground with a Cessna Citation II jet with 2 pilots and 2 passengers. The plane then caught fire after having crashed into an airport baggage hangar causing the death of 4 other victims among the groundstaff. The accident claimed a total of 118 victims of 9 nationalities. Based on our experience from investigation of the Finnish victims, we explore how current national legislations of the EU member states and varying compliance with existing recommendations may influence the medico-legal investigation of a mass disaster. Legislative measures and further harmonisation of medico-legal procedures in connection with mass disasters within the EU are needed.

Forensic osteological investigations in Kosovo.

A team of Finnish forensic experts performed investigations of alleged mass graves in Kosovo under the mandate of the European Union (EU). Human skeletal remains from two locations were examined. The remains contained three almost complete skeletons, and individual bones and bone fragments, part of which were burned. Injuries, pathological changes, and findings for identification purposes were examined and documented using standard methods of forensic pathology and osteology. Gunshot injuries were found in some cases, but reliable determination of the cause and manner of death was not possible. A discrepancy arose between the number of victims reported in information received from the presiding district court, and results of the investigations. The estimation of the minimum number of victims was mostly acquired by DNA analysis.

Identification of victims from the M/S Estonia.

With 852 victims from 17 different countries, the sinking of the Estonia was Europe's most severe passenger ferry disaster. The Finnish Disaster Victim Identification (DVI) team identified all 93 victims recovered from the sea within 33 days of the accident as well as victim number 94 found 18 months later. Dental identification was established in 57 cases (60%).

Practical and legal aspects of forensic autopsy expert team operations.

Finnish forensic experts have investigated remains of the victims of alleged mass violence in the former Yugoslavia in 1996 under the mandate of the United Nations, and in 1998 and 1999 under the mandate of the European Union. The investigative documents later were surrendered to the International Criminal Tribunal for the former Yugoslavia (ICTY). The indictments issued by the ICTY include charges even against the highest authorities of the Federal Republic of Yugoslavia. This study describes the experience gained in organising forensic expert team operations in a foreign state by the Finnish team. The establishment and operation of a forensic expert team in a foreign state involve, among other things, legal issues, often related to differing legal systems. From an independent forensic expert team, great objectivity and self-constraint are expected. Moreover, a clear and sufficiently detailed agreement on the mandate of the team and on the possibility for unhindered and safe access of the experts to the alleged mass graves, as well as the assembling and briefing of the team members and provision of the necessary equipment should be completed before the beginning of the mission. Furthermore, the application of adequate and internationally recognised methods for processing and documenting the examination is essential for team's credibility.

Radiology in forensic expert team operations.

Radiological methods are widely used in forensic pathology. Their most common applications are in complementing human identification, particularly in investigations of mass disasters and decomposed bodies, and in searching for foreign material inside corpses. A team of Finnish forensic experts investigated human skeletal remains in Bosnia and Herzegovina (1996) and in Kosovo, the Federal Republic of Yugoslavia (1998). It also investigated more recently deceased victims in Kosovo (1999). In these investigations, the benefit of X-ray was in the detection of foreign material inside victims and their remains. For identification purposes, X-rays were mainly used to provide the best evidence possible of any pathological changes, physical characteristics, and injuries present.

Forensic investigations in Kosovo: experiences of the European Union Forensic Expert Team.

The international community has intervened ethnic hostilities in Kosovo, the Federal Republic of Yugoslavia. A team of Finnish forensic experts worked in December 1998 and January 1999 in Kosovo under the mandate of the European Union. The team investigated human remains from three locations of alleged ethnic violence. Concerning the events in Klecka, Volujak and Racak, the International Criminal Tribunal for the former Yugoslavia received documents of great gravity. The standard methods of forensic pathology were complemented with radiological, forensic odontological, physical anthropological and molecular genetic investigations.

Increased levels of interleukin-6 and interleukin-10 in the peritoneal fluid of patients with endometriosis.

OBJECTIVE: The levels of interleukin-2, interleukin-4, interleukin-5, interleukin-6, interleukin-10, and granulocyte-macrophage colony-stimulating factor were measured in the peritoneal fluid of 15 patients with endometriosis to characterize the type of immune response that occurs at the site of endometriosis. STUDY DESIGN: Cytokine levels in peritoneal fluid obtained during laparoscopy from 15 patients and 12 controls undergoing tubal ligation were determined by enzyme-linked immunosorbent assay. RESULTS: The mean levels of interleukin-6 in patients with endometriosis and controls were 797 +/- 407 pg/ml and 133 +/- 38 pg/ml, respectively (p < 0.02). Similarly, the mean concentration of interleukin-10 in peritoneal fluids of patients with endometriosis was significantly higher than that of controls (241 +/- 38 vs 128 +/- 21, p < 0.05). The levels of interleukin-2, interleukin-4, interleukin-5, and granulocyte-macrophage colony-stimulating factor were not significantly different between the two study groups. CONCLUSIONS: The levels of interleukin-6 and interleukin-10 are increased in the peritoneal fluids of patients with endometriosis, suggesting enhanced macrophage activity in these patients. Increased interleukin-6 and interleukin-10 production may partially contribute to the disturbed immune regulation observed in patients with endometriosis.

Ultrastructure of dentin matrix in heritable dentin defects.

Heritable dentin defects form a group of diseases which exclusively affect dentin among the various dental tissues. While one type is associated with the generalized connective tissue disorder, osteogenesis imperfecta, other types occur as single traits. The clinical manifestations of the dentin defects vary from insignificant to severe enough to cause aesthetical and functional failure of the teeth. Scanning and transmission electron microscopic studies, reviewed in this paper, have markedly clarified the ultrastructure of the aberrant dentin matrix. Both similar and different changes seem to occur in the various forms of heritable dentin defects. Abnormalities in the appearance and organization pattern of collagen fibers in the defective dentin partly resemble those observed in skin in generalized connective tissue diseases. The similarity of ultrastructural findings in dentin defects, which are currently classified as distinct entities, and even in diseases affecting other tissues, could be related to the complicated interactions between the extracellular matrix macromolecules. Thus, many of the changes observed may be secondary in nature. Ultrastructural studies can help us to understand the pathogenesis of the different types of heritable dentin defects as well as aid in diagnostics and classification of these diseases.

Heritable dentin defects: nosology, pathology, and treatment.

Heritable dentin defects have been divided into 2 main categories: dentinogenesis imperfecta (DI) and dentin dysplasia (DD). Recent studies have shown that they share many features in common. Of the connective tissue diseases, only osteogenesis imperfecta (OI) has been linked to these disorders. So far, no definitive relation between the type of OI and the dental involvement can be established. Familial occurrence of DI with OI cannot be comprehensively explained by mutations in type I collagen genes. No information about the gene defects in DD is available. At the ultrastructural level, the organization of the normally cross-striated collagen fibers in the dentin matrix varies markedly in patients affected by DI.

[The Patient Injury Act in Finland]. / Le "Patient Injury Act" en Finlande.

In Finland, the "Patient Injury Act" came into force on 1 May 1987. The legislation covers all patients given medical treatment in Finland. Injuries defined by the law fall into four categories: actual treatment injury, infection injury, accidental injury and diagnostic injury. The claim can be entered without any evidence of fault or causation.

[Child abuse: role of the dentist and problems of differential diagnosis]. / Maltraitance d'enfants: le rôle du dentiste et les problèmes du diagnostic différentiel.

Child abuse and neglect is now recognised as an international issue and the reported frequencies of mortality vary considerably. Dental personnel has an important role in suspecting abuse and diagnosing non-accidental injury, because oro-facial trauma occur in approximately half of all cases. The critical steps to ensure adequate professional response in suspected child abuse cases are the development of diagnostic criteria, curriculum and treatment guidelines.

Ehlers Danlos syndrome type I with novel dental features.

The clinical, radiographic and histologic findings are described in two cases of Ehlers Danlos Syndrome Type I with novel dental features. Defective dentinogenesis principally affecting the mandibular incisors result in aplasia or hypoplasia of root development predisposing to localized periodontal disease. A striking radiographic appearance with a bulbous enlargement of the roots together with pulp stones is seen in other teeth. 'Giant channels' and vascular inclusions resembling 'intermediate cementum' are prominent within this area. No evidence of Type III procollagen or collagen was detected with indirect immunofluorescence. It is suggested that an inherited collagen abnormality in a component common to dentin, skin, ligament and tendon probably explains both EDS I and the dentin dysplasia.

Transmission electron microscopic appearance of dentin matrix in type II dentin dysplasia.

Dentin matrix of demineralized primary and permanent teeth with type II dentin dysplasia was studied by transmission electron microscopy. The coronal dentin of a maxillary third molar exhibited a normal structure. In the radicular dentin, tubules were few in number; the major part of the dentin was composed of thick, curvy bundles of cross-striated collagen fibers. In the most aberrant areas of the radicular dentin, coarse collagen fibers measuring up to 140 nm in thickness were observed. The dentin of the primary tooth showed a similar, but somewhat less irregular, structure.

Familial hypodontia associated with Dupuytren's disease.

A three-generation Finnish family exhibited hypodontia associated with Dupuytren's disease (contracture). Of the known 32 members of the family, contracture has been diagnosed thus far in 5 individuals, 4 of these also with hypodontia. No other connective tissue involvement was found. For comparison, three other families were studied, also showing incomplete penetrance of hypodontia. Bearing in mind the genetic isolation of the Finnish population, this finding may be coincidental. The possibility of partially common genetic background cannot, however, be excluded.