Treatment for cervical intraepithelial neoplasia and subsequent IVF deliveries.

Background: The aim was to study whether the treatment of cervical intraepithelial neoplasia (CIN) is associated with a subsequent increase in the use of IVF to achieve deliveries and whether women with cervical treatment and IVF have increased rates of preterm delivery.

Methods: This was a register-based retrospective cohort (n = 822 183 deliveries) study from Finland whose main outcome measures were the rates of IVF and preterm deliveries in different CIN treatment groups.

Results: Of all deliveries in Finland, 1.

Explosive volcanism on the ultraslow-spreading Gakkel ridge, Arctic Ocean.

Roughly 60% of the Earth's outer surface is composed of oceanic crust formed by volcanic processes at mid-ocean ridges. Although only a small fraction of this vast volcanic terrain has been visually surveyed or sampled, the available evidence suggests that explosive eruptions are rare on mid-ocean ridges, particularly at depths below the critical point for seawater (3,000 m). A pyroclastic deposit has never been observed on the sea floor below 3,000 m, presumably because the volatile content of mid-ocean-ridge basalts is generally too low to produce the gas fractions required for fragmenting a magma at such high hydrostatic pressure.

Using population mixtures to optimize the utility of genomic databases: linkage disequilibrium and association study design in India.

When performing association studies in populations that have not been the focus of large-scale investigations of haplotype variation, it is often helpful to rely on genomic databases in other populations for study design and analysis - such as in the selection of tag SNPs and in the imputation of missing genotypes. One way of improving the use of these databases is to rely on a mixture of database samples that is similar to the population of interest, rather than using the single most similar database sample. We demonstrate the effectiveness of the mixture approach in the application of African, European, and East Asian HapMap samples for tag SNP selection in populations from India, a genetically intermediate region underrepresented in genomic studies of haplotype variation.

Demographic history of european populations of Arabidopsis thaliana.

The model plant species Arabidopsis thaliana is successful at colonizing land that has recently undergone human-mediated disturbance. To investigate the prehistoric spread of A. thaliana, we applied approximate Bayesian computation and explicit spatial modeling to 76 European accessions sequenced at 876 nuclear loci.

Genotype, haplotype and copy-number variation in worldwide human populations.

Genome-wide patterns of variation across individuals provide a powerful source of data for uncovering the history of migration, range expansion, and adaptation of the human species. However, high-resolution surveys of variation in genotype, haplotype and copy number have generally focused on a small number of population groups. Here we report the analysis of high-quality genotypes at 525,910 single-nucleotide polymorphisms (SNPs) and 396 copy-number-variable loci in a worldwide sample of 29 populations.

The incidence of preterm deliveries decreases in Finland.

Objective: We examined the trends and risk factors of preterm delivery.

Design: Register-based retrospective cohort study from Finland.

Setting: National Medical Birth Register data during 1987-2005.

Genetic variation and population structure in native Americans.

We examined genetic diversity and population structure in the American landmass using 678 autosomal microsatellite markers genotyped in 422 individuals representing 24 Native American populations sampled from North, Central, and South America. These data were analyzed jointly with similar data available in 54 other indigenous populations worldwide, including an additional five Native American groups. The Native American populations have lower genetic diversity and greater differentiation than populations from other continental regions.

Family members' perceived needs for bereavement follow-up.

Palliative care does not end with the death of the patient, and many palliative care services offer specific follow-up services for the bereaved. The aims of this study were to quantitate perceived bereavement needs and to qualitatively describe these needs. The study design was cross-sectional and targeted family members three to nine months after the patient's death.

CLUMPP: a cluster matching and permutation program for dealing with label switching and multimodality in analysis of population structure.

Motivation: Clustering of individuals into populations on the basis of multilocus genotypes is informative in a variety of settings. In population-genetic clustering algorithms, such as BAPS, STRUCTURE and TESS, individual multilocus genotypes are partitioned over a set of clusters, often using unsupervised approaches that involve stochastic simulation. As a result, replicate cluster analyses of the same data may produce several distinct solutions for estimated cluster membership coefficients, even though the same initial conditions were used.

The probability distribution under a population divergence model of the number of genetic founding lineages of a population or species.

The composition of genetic variation in a population or species is shaped by the number of events that led to the founding of the group. We consider a neutral coalescent model of two populations, where a derived population is founded as an offshoot of an ancestral population. For a given locus, using both recursive and nonrecursive approaches, we compute the probability distribution of the number of genetic founding lineages that have given rise to the derived population.

Preterm delivery after surgical treatment for cervical intraepithelial neoplasia.

Objective: To study whether a treatment of cervical intraepithelial neoplasia (CIN) is associated with an adverse outcome in the subsequent pregnancies.

Methods: This study is a register-based retrospective cohort study from Finland. National data of 25,827 women having a surgical treatment of the cervix for CIN in 1986-2003 and their 8,210 subsequent singleton births in 1987-2004 were studied.

The evolutionary history of the common chloroplast genome of Arabidopsis thaliana and A. suecica.

The evolutionary history of the common chloroplast (cp) genome of the allotetraploid Arabidopsis suecica and its maternal parent A. thaliana was investigated by sequencing 50 fragments of cpDNA, resulting in 98 polymorphic sites. The variation in the A.

Evolution of chloroplast mononucleotide microsatellites in Arabidopsis thaliana.

The level of variation and the mutation rate were investigated in an empirical study of 244 chloroplast microsatellites in 15 accessions of Arabidopsis thaliana. In contrast to SNP variation, microsatellite variation in the chloroplast was found to be common, although less common than microsatellite variation in the nucleus. No microsatellite variation was found in coding regions of the chloroplast.

A worldwide survey of haplotype variation and linkage disequilibrium in the human genome.

Recent genomic surveys have produced high-resolution haplotype information, but only in a small number of human populations. We report haplotype structure across 12 Mb of DNA sequence in 927 individuals representing 52 populations. The geographic distribution of haplotypes reflects human history, with a loss of haplotype diversity as distance increases from Africa.

The Cenozoic palaeoenvironment of the Arctic Ocean.

The history of the Arctic Ocean during the Cenozoic era (0-65 million years ago) is largely unknown from direct evidence. Here we present a Cenozoic palaeoceanographic record constructed from >400 m of sediment core from a recent drilling expedition to the Lomonosov ridge in the Arctic Ocean. Our record shows a palaeoenvironmental transition from a warm 'greenhouse' world, during the late Palaeocene and early Eocene epochs, to a colder 'icehouse' world influenced by sea ice and icebergs from the middle Eocene epoch to the present.

A unique recent origin of the allotetraploid species Arabidopsis suecica: Evidence from nuclear DNA markers.

A coalescent-based method was used to investigate the origins of the allotetraploid Arabidopsis suecica, using 52 nuclear microsatellite loci typed in eight individuals of A. suecica and 14 individuals of its maternal parent Arabidopsis thaliana, and four short fragments of genomic DNA sequenced in a sample of four individuals of A. suecica and in both its parental species A.

The pattern of polymorphism in Arabidopsis thaliana.

We resequenced 876 short fragments in a sample of 96 individuals of Arabidopsis thaliana that included stock center accessions as well as a hierarchical sample from natural populations. Although A. thaliana is a selfing weed, the pattern of polymorphism in general agrees with what is expected for a widely distributed, sexually reproducing species.

Mode of reproduction in Arabidopsis suecica.

The breeding system of Arabidopsis suecica was investigated through genetic analysis of microsatellite segregation patterns in five controlled crosses as well as in 16 single-mother families collected in the wild. Analysis of single and two-locus segregations in the F2 generation following a cross clearly shows that A. suecica is reproduces sexually.

Enhanced ice sheet growth in Eurasia owing to adjacent ice-dammed lakes.

Large proglacial lakes cool regional summer climate because of their large heat capacity, and have been shown to modify precipitation through mesoscale atmospheric feedbacks, as in the case of Lake Agassiz. Several large ice-dammed lakes, with a combined area twice that of the Caspian Sea, were formed in northern Eurasia about 90,000 years ago, during the last glacial period when an ice sheet centred over the Barents and Kara seas blocked the large northbound Russian rivers. Here we present high-resolution simulations with an atmospheric general circulation model that explicitly simulates the surface mass balance of the ice sheet.

Next of kin's experience of powerlessness and helplessness in palliative home care.

Goals Of Work: Powerlessness and helplessness have been very little studied. The aims of this study were (1) to describe what characterise such experiences and the meaning of them to next of kin of cancer patients in advanced palliative home care and (2) to make quantifications.

Patients And Methods: The study design was cross-sectional and targeted next of kin during ongoing palliative home care and next of kin of patients who had died 3-9 months earlier; 233 next of kin responded (response rate 72%) to a postal questionnaire with both Likert-type and open-ended questions.

Chloroplast DNA indicates a single origin of the allotetraploid Arabidopsis suecica.

DNA sequencing was performed on up to 12 chloroplast DNA regions [giving a total of 4288 base pairs (bp) in length] from the allopolyploid Arabidopsis suecica (48 accessions) and its two parental species, A. thaliana (25 accessions) and A. arenosa (seven accessions).

Ice shelves in the Pleistocene Arctic Ocean inferred from glaciogenic deep-sea bedforms.

It has been proposed that during Pleistocene glaciations, an ice cap of 1 kilometre or greater thickness covered the Arctic Ocean. This notion contrasts with the prevailing view that the Arctic Ocean was covered only by perennial sea ice with scattered icebergs. Detailed mapping of the ocean floor is the best means to resolve this issue.

Fentanyl patches for the treatment of pain in dying cancer patients.

It has been claimed that fentanyl patches are less suitable for elderly patients and for patients who are terminally ill and dying. In a retrospective survey of 205 cancer patients who died within the hospital-based home care in Norrköping, Sweden between January 1997 and June 1998 we identified 34 patients who had used fentanyl patches. 30 patients were possible to evaluate for the analgesic efficacy of transdermal fentanyl.