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61.
62.
To date, the field of contaminant geochemistry—which deals with the study of chemical interactions in soil and aquifer environments—has
focused mainly on pollutant toxicity, retention, persistence, and transport and/or on remediation of contaminated sites. Alteration
of subsurface physicochemical properties by anthropogenic chemicals, which reach the land surface as a result of human activity,
has been essentially neglected. Contaminant-induced changes in subsurface properties are usually considered as deviations
from a normal geological environment, which will disappear under natural attenuation or following remediation procedures.
However, contaminants may in many cases cause irreversible changes in both structure and properties of the soil–subsurface
geosystem between the land surface and groundwater. The time scales associated with these changes are on a “human time scale”,
far shorter than geological scales relevant for geochemical processes. In this review, we draw attention to a new perspective
of contaminant geochemistry, namely, irreversible changes in the subsurface as a result of anthropogenic chemical pollution.
We begin by briefly reviewing processes governing contaminant–subsurface interactions. We then survey how chemical contamination
causes irreversible changes in subsurface structure and properties. The magnitude of the anthropogenic impact on the soil
and subsurface is linked directly to the amounts of chemical contaminants applied and/or disposed of on the land surface.
This particular aspect is of major importance when examining the effects of humans on global environmental changes. Consideration
of these phenomena opens new perspectives for the field of contaminant geochemistry and for research of human impacts on the
soil and subsurface regimes. 相似文献
63.
64.
A field hospital overseas requires various types of communication equipment. This study presents the communications equipment used by three Israeli field hospital delegations to earthquake sites at Adapazari, Turkey, in 1999, Port‐au‐Prince, Haiti, in 2010 and Minamisanriku, Japan, in 2011. The delegations to Turkey and Haiti were relatively large (105–230 personnel) and were on the site early (three to four days after each event). The 55‐person delegation to Japan arrived later and was established as an outpatient community hospital. Standard military VHF radios were the only effective tool up to 5 km, until cellular coverage was regained (1–2 weeks after each event). International communication was good. While short‐wave communication (telephone and Internet) was used in Turkey, a direct satellite channel was set up in Haiti. In Japan, BGAN Inmarsat provided efficient Wi‐Fi for all needs. Motorola walkie talkies were not efficient beyond the immediate vicinity. This paper recommends continued use of military‐specification equipment alongside newer modalities, particularly in situations where infrastructure is damaged. 相似文献
65.
The size of the regional species pool may influence local patterns of diversity. However, it is unclear whether certain spatial scales are less sensitive to regional influences than others. Additive partitioning was used to separate coral-dwelling fish diversity to its alpha and beta components, at multiple scales, in several regions across the Indo-Pacific. We then examined how the relative contribution of these components changes with increased regional diversity. By employing specific random-placement null models, we overcome methodological problems with local-regional regressions. We show that, although alpha and beta diversities within each region are consistently different from random-placement null models, the increase in beta diversities among regions was similar to that predicted once heterogeneity in coral habitat was accounted for. In contrast, alpha diversity within single coral heads was limited and increased less than predicted by the null models. This was correlated with increased intraspecific aggregation in more diverse regions and is consistent with ecological limitations on the number of coexisting species at the local scale. These results suggest that, apart from very small spatial scales, variation in the partitioning of fish diversity along regional species richness gradients is driven overwhelmingly by the corresponding gradients in coral assemblage structure. 相似文献
66.
Yifat Ochshorn Michael J. Kupferminc Igal Wolman Avi Orr-Urtreger Ariel J. Jaffa Yuval Yaron 《黑龙江环境通报》2001,21(7):547-549
Combined first trimester screening using pregnancy associated plasma protein-A (PAPP-A), free β-human chorionic gonadotrophin, and nuchal translucency (NT), is currently accepted as probably the best combination for the detection of Down syndrome (DS). Current first trimester algorithms provide computed risks only for DS. However, low PAPP-A is also associated with other chromosome anomalies such as trisomy 13, 18, and sex chromosome aneuploidy. Thus, using currently available algorithms, some chromosome anomalies may not be detected. The purpose of the present study was to establish a low-end cut-off value for PAPP-A that would increase the detection rates for non-DS chromosome anomalies. The study included 1408 patients who underwent combined first trimester screening. To determine a low-end cut-off value for PAPP-A, a Receiver–Operator Characteristic (ROC) curve analysis was performed. In the entire study group there were 18 cases of chromosome anomalies (trisomy 21, 13, 18, sex chromosome anomalies), 14 of which were among screen-positive patients, a detection rate of 77.7% for all chromosome anomalies (95% CI: 55.7–99.7%). ROC curve analysis detected a statistically significant cut-off for PAPP-A at 0.25 MoM. If the definition of screen-positive were to also include patients with PAPP-A<0.25 MoM, the detection rate would increase to 88.8% for all chromosome anomalies (95% CI: 71.6–106%). This low cut-off value may be used until specific algorithms are implemented for non-Down syndrome aneuploidy. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
67.
Noa Hourvitz Alina Kurolap Adi Mory Karina Krajden Haratz Dvora Kidron Gustavo Malinger Hagit Baris Feldman Yuval Yaron 《黑龙江环境通报》2023,43(10):1374-1377
A Jewish couple of mixed origin was referred for genetic counseling following termination of pregnancy at 18 weeks of gestation due to severe ventriculomegaly with aqueduct stenosis. Trio exome sequencing revealed a loss-of-function heterozygous variant in the SMARCC1 gene inherited from an unaffected mother. The SMARCC1 gene is associated with embryonic neurodevelopmental processes. Recent studies have linked perturbations of the gene with autosomal dominant congenital hydrocephalus, albeit with reduced penetrance. However, these studies were not referenced in the SMARCC1 OMIM record (*601732) and the gene was not considered, at the time, an OMIM morbid gene. Following our case and appeal, SMARCC1 is now considered a susceptibility gene for hydrocephalus. This allowed us to reclassify the variant as likely pathogenic and empowered the couple to make informed reproductive choices. 相似文献