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Related Concept Videos

Quality of Water01:19

Quality of Water

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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
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Quality Assurance01:19

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Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...
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Water and Mineral Acquisition02:34

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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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Updated: Jan 24, 2026

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Uranium in drinking water: effects on mouse oocyte quality.

Miriam S Kundt1, Carolina Martinez-Taibo, Maria C Muhlmann

  • 1CNEA, Vuelta de Obligado 2893, Ciudad Autonoma de Buenos Aires, 1429 Argentina. kundt@cnea.gov.ar

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Chronic uranium exposure via drinking water significantly increased oocyte abnormalities and nuclear damage in female mice. These reproductive toxicological effects occurred in a dose-dependent manner, indicating uranium

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Area of Science:

  • Reproductive Toxicology
  • Environmental Health
  • Uranium Contamination

Background:

  • Uranium exposure is a growing environmental concern.
  • Understanding the reproductive health impacts of uranium is crucial.
  • Chronic exposure effects on female reproductive toxicology require detailed investigation.

Purpose of the Study:

  • To evaluate the reproductive toxicological effects of chronic uranium exposure in female mice.
  • To assess uranium's impact on oocyte quality, chromatin organization, and nuclear integrity.
  • To determine the dose-dependent relationship and lowest observed adverse effect level (LOAEL) of uranium exposure.

Main Methods:

  • Swiss female mice were chronically administered uranyl nitrate in drinking water at 2.5, 5, and 10 mgU/kg/d for 40 days.
  • Evaluated parameters included the number and quality of ovulated oocytes, chromatin organization, and cumulus cell (CC) micronucleation.
  • Statistical analysis was performed to determine dose-dependency and significance of observed effects.

Main Results:

  • Uranium exposure significantly increased oocyte dysmorphism in a dose-independent manner.
  • Metaphase plate abnormalities and CC micronucleation increased significantly and in a dose-dependent manner with uranium exposure.
  • The LOAEL for reproductive toxicity in female mice was estimated below 2.5 mgU/kg/d.

Conclusions:

  • Chronic uranium contamination in drinking water adversely affects female mouse oocyte quality and nuclear integrity.
  • Oocytes and their microenvironment demonstrate high sensitivity to uranium exposure.
  • The findings highlight the need for monitoring uranium levels in drinking water to protect reproductive health.