Browse
Submit Data
Databases
API
Help

Dataset Information

10 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Archaeomagnetic results from Cambodia in Southeast Asia: Evidence for possible low-latitude flux expulsion.

ABSTRACT: Extensive spatial and temporal distribution of high-quality data are essential for understanding regional and global behaviors of the geomagnetic field. We carried out chronological and archaeomagnetic studies at the Angkor-era iron-smelting site of Tonle Bak in Cambodia in Southeast Asia, an area with no data available to date. We recovered high-fidelity full-vector geomagnetic information from the 11th to 14th century for this region, which fill gaps in the global distribution of data and will significantly improve the global models. These results reveal a sharp directional change of the geomagnetic field between 1200 and 1300 CE, accompanied by an intensity dip between 1100 and 1300 CE. The fast geomagnetic variation recorded by our data provides evidence for the possible existence of low-latitude flux expulsion. Related discussions in this paper will inspire a new focus on detailed geomagnetic research in low-latitude areas around the equator, and exploration of related dynamic processes.

SUBMITTER: Cai S

PROVIDER: S-EPMC7980391 | biostudies-literature |

REPOSITORIES: biostudies-literature

ACCESS DATA

Json Xml

Similar Datasets

Population Prehistory in Island Southeast Asia

Project description:Affymetrix single nucleotide polymorphism (SNP) array data were collected to study genome-wide patterns of genomic variation across a broad geographical range of Island Southeast Asian populations. This region has experienced an extremely complex admixture history. Initially settled ~50,000 years ago, Island Southeast Asia has since been the recipient of multiple waves of population movements, most recently by Austronesian-speaking groups ultimately from Neolithic mainland Asia and later arrivals during the historic era from India and the Middle East. We have genotyped SNPs in ~500 individuals from 30 populations spanning this entire geographical region, from communities close to mainland Asia through to New Guinea. Particular attention has been paid to genomic data that are informative for population history, including the role of recent arrivals during the historic era and admixture with archaic hominins.

2017-08-02 | GSE80534 | GEO

Possible new hepatitis B virus genotype, southeast Asia.

Project description:We conducted a phylogenetic analysis of 19 hepatitis B virus strains from Laos that belonged to 2 subgenotypes of a new genotype I. This emerging new genotype likely developed outside Southeast Asia and is now found in mixed infections and in recombinations with local strains in a geographically confined region.

| S-EPMC2630741 | biostudies-literature

Southeast Asia Mammals

Project description:Shotgun sequencing of Southeast Asia mammals

| PRJNA361218 | ENA

Community-based management of epilepsy in Southeast Asia: Two intervention strategies in Lao PDR and Cambodia.

Project description:BackgroundEpilepsy affects more than 50 million people worldwide, 80% of whom live in low- and middle-income countries (LMICs). In Southeast Asia, the prevalence is moderate (6‰), and the main public health challenge is reducing the treatment gap, which reaches more than 90% in rural areas.MethodsThis 12-month comparative study (intervention vs. control areas) assessed the community effectiveness of two different strategies for the identification and home follow-up of people with epilepsy by Domestic Health Visitors for epilepsy (DHVes). In Lao PDR, DHVes were health center staff covering several villages via monthly visits; in Cambodia, DHVes were health volunteers living in the villages.FindingsAt baseline, the treatment gap was >95% in Lao PDR and 100% in Cambodia. After 12 months, the treatment gap in Lao PDR decreased by 5·5% (range: 4·0-12·2) in the intervention area and 0·5% (range: 0·4-0·8) in the control area (p<0·0001). In Cambodia, the treatment gap decreased by 34·9% (range: 29·0-44·1) in the intervention area and 8·1% (range: 6·7-10·2) in the control area (p<0·0001). Among the PWEs followed at home by the DHVes, the proportion adhering to drug treatment was 85·2% in Lao PDR and 78·1% in Cambodia. The cost associated with strategy implemented in Cambodia, compared with the control area, was lower than the cost associated with strategy implemented in Lao PDR."InterpretationThe treatment gap was significantly reduced with both intervention strategies, but the effect was larger in Cambodia. The results of this cost analysis pave the way for scaling-up in rural areas of Lao PDR and Cambodia, and experimental adaptation in other LMICs.FundingThe study was funded by the Global Health Department of Sanofi and Grand Challenges Canada (grant number 0325-04).

| S-EPMC8315387 | biostudies-literature

Insolation-paced sea level and sediment flux during the early Pleistocene in Southeast Asia.

Project description:Global marine archives from the early Pleistocene indicate that glacial-interglacial cycles, and their corresponding sea-level cycles, have predominantly a periodicity of ~ 41 kyrs driven by Earth's obliquity. Here, we present a clastic shallow-marine record from the early Pleistocene in Southeast Asia (Cholan Formation, Taiwan). The studied strata comprise stacked cyclic successions deposited in offshore to nearshore environments in the paleo-Taiwan Strait. The stratigraphy was compared to both a δ18O isotope record of benthic foraminifera and orbital parameters driving insolation at the time of deposition. Analyses indicate a strong correlation between depositional cycles and Northern Hemisphere summer insolation, which is precession-dominated with an obliquity component. Our results represent geological evidence of precession-dominated sea-level fluctuations during the early Pleistocene, independent of a global ice-volume proxy. Preservation of this signal is possible due to the high-accommodation creation and high-sedimentation rate in the basin enhancing the completeness of the stratigraphic record.

| S-EPMC8373940 | biostudies-literature

Solar energy policies in southeast Asia towards low carbon emission: A review.

Project description:Globally, countries are developing policies and encouraging the implementation of sustainable energy resources to reduce the harmful effects of fossil fuels on the environment and energy-related CO2 emissions. In 2019, global energy-related CO2 emissions increased by 1.8% to a new high of 33.3 Gt CO2, owing to the increasing energy consumption. The CO₂ emissions are significantly increasing due to continuing increase of Southeast Asian countries. Energy utilization contributes to CO2 emissions on earth because the energy sector produces 32,553.48 MtCO2 of CO2, or about 73% of total CO₂ emissions (WRI, 2019). The power sector alone accounted for approximately two-thirds of the emissions rise, indirectly warming the climate system, earth's temperature, and sea level. As a result, several governments have enacted policies to increase solar energy's share of the energy mix to minimize dependence on fossil fuels and environmental devastation. Therefore, this review paper presents a survey of solar energy policies implemented in Southeast Asian countries, specifically Malaysia, and assesses effective existing solar energy strategies in developed countries. Moreover, the implementation of Net Energy Metering needed for the advancing and widespread use of renewable energy technologies is also reviewed. Malaysia's existing solar energy policies have also been assessed and compared to the selected high-income nations. Lastly, limitations and key challenges of implementing large-scale applications of net energy metering policies are also presented.

| S-EPMC10025915 | biostudies-literature

Molecular pathology quality control in Southeast Asia: Results of a multiregional quality assurance study from MASTER KEY Asia.

Project description:Tissue specimen quality assurance is a major issue of precision medicine for rare cancers. However, the laboratory standards and quality of pathological specimens prepared in Asian hospitals remain unknown. To understand the methods in Southeast Asian oncology hospitals and to clarify how pre-analytics affect the quality of formalin-fixed paraffin-embedded (FFPE) specimens, a questionnaire surveying pre-analytical procedures (Part I) was administered, quality assessment of immunohistochemistry (IHC) staining and DNA/RNA extracted from the representative FFPE specimens from each hospital (Part II) was conducted, and the quality of DNA/RNA extracted from FFPE of rare-cancer patients for genomic sequencing (Part III) was examined. Quality measurements for DNA/RNA included ΔΔCt, DV200, and cDNA yield. Six major cancer hospitals from Malaysia, Philippines, and Vietnam participated. One hospital showed unacceptable quality for the DNA/RNA assessment, but improved by revising laboratory procedures. Only 57% (n = 73) of the 128 rare-cancer patients' specimens met both DNA and RNA quality criteria for next-generation sequencing. Median DV200 was 80.7% and 64.3% for qualified and failed RNA, respectively. Median ΔΔCt was 1.25 for qualified and 4.89 for failed DNA. Longer storage period was significantly associated with poor DNA (fail to qualify ratio = 1579:321 days, p < 0.001) and RNA (fail to qualify ratio = 1070:280 days, p < 0.001). After improvement of pre-analytical factors, the qualification rate increased for hospitals A and E from 41.5% to 70.5% and 62.5% to 86%, respectively. This is the first report to elucidate the pre-analytical laboratory procedures of main Southeast Asian oncology hospitals. An external quality assessment program may improve factors associated with tumor FFPE specimen quality.

| S-EPMC10236618 | biostudies-literature

The Prehistoric Peopling of Southeast Asia

Project description:The Prehistoric Peopling of Southeast Asia

| PRJEB26721 | ENA

A mitochondrial stratigraphy for island southeast Asia.

Project description:Island Southeast Asia (ISEA) was first colonized by modern humans at least 45,000 years ago, but the extent to which the modern inhabitants trace their ancestry to the first settlers is a matter of debate. It is widely held, in both archaeology and linguistics, that they are largely descended from a second wave of dispersal, proto-Austronesian-speaking agriculturalists who originated in China and spread to Taiwan approximately 5,500 years ago. From there, they are thought to have dispersed into ISEA approximately 4,000 years ago, assimilating the indigenous populations. Here, we demonstrate that mitochondrial DNA diversity in the region is extremely high and includes a large number of indigenous clades. Only a fraction of these date back to the time of first settlement, and the majority appear to mark dispersals in the late-Pleistocene or early-Holocene epoch most likely triggered by postglacial flooding. There are much closer genetic links to Taiwan than to the mainland, but most of these probably predated the mid-Holocene "Out of Taiwan" event as traditionally envisioned. Only approximately 20% at most of modern mitochondrial DNAs in ISEA could be linked to such an event, suggesting that, if an agriculturalist migration did take place, it was demographically minor, at least with regard to the involvement of women.

| S-EPMC1876738 | biostudies-other

Bordetella hinzii in rodents, Southeast Asia.

Project description: Not available

| S-EPMC3647655 | biostudies-literature