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Masonry in Cold and Hot Weather Conditions01:21

Masonry in Cold and Hot Weather Conditions

In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
Other key practices include keeping masonry units and sand dry and...
Thermal Insulation in Masonry Walls01:22

Thermal Insulation in Masonry Walls

In hot, dry climates, the thermal mass of masonry walls can be beneficial, absorbing heat during the day and releasing it at night, thereby stabilizing indoor temperatures. However, in most other climates, additional insulation is necessary to enhance thermal resistance.
External insulation can be applied using an Exterior Insulation and Finish System (EIFS), which involves affixing panels of plastic foam to the wall and covering them with a polymeric stucco reinforced with glass fiber mesh.
Physical Methods for Controlling Microbial Growth: Temperature01:23

Physical Methods for Controlling Microbial Growth: Temperature

Heat is a widely used method to control microbial growth by targeting and denaturing cellular proteins, thereby killing or inactivating microbes. This method's effectiveness is quantified using parameters such as the thermal death point (TDP), thermal death time (TDT), and decimal reduction time (D value). TDP represents the lowest temperature at which all microorganisms in a liquid suspension are eliminated within 10 minutes, whereas TDT is the time necessary to achieve sterilization at a...
Thermal Strain01:19

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
Microbial Mats01:25

Microbial Mats

Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.

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相关实验视频

Updated: Jul 12, 2026

Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites
09:39

Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites

Published on: September 5, 2025

对抗蓝色菌的战争

G B Lucas

    Science (New York, N.Y.)
    |October 10, 1980
    PubMed
    概括

    在烟草作物中,一场毁灭性的蓝菌疫情在北美和古巴造成了巨大的经济损失. 有效的控制策略受到真菌耐药性的挑战,需要国际合作.

    科学领域:

    • 植物病理学 植物病理学
    • 农业科学 农业科学
    • 菌类学 菌类学是指菌类学.

    背景情况:

    • 1979年,由真菌引起的烟草蓝菌疫情导致美国和加拿大的经济损失巨大.
    • 这种疾病起源于古巴,1979年摧毁了50%的作物,1980年摧毁了90%的作物.
    • 蓝色菌对全球烟草生产构成重大威胁.

    研究的目的:

    • 为了强调与1979年烟草蓝菌疫情相关的影响和挑战.
    • 讨论目前烟草蓝菌的控制方法的局限性.
    • 强调需要合作解决方案来管理这种植物疾病.

    主要方法:

    • 这项研究是对1979年蓝色菌流行病的回顾.
    • 对疾病对作物产量和经济损失的影响分析.
    • 对控制策略的评估,包括耐药品种和杀菌剂.

    主要成果:

    • 据估计,这次疫情在美国和加拿大造成了近2.5亿美元的经济损失.
    • 耐药烟草品种被证明是暂时的解决方案,耐药性在几年内崩.
    • 杀菌剂 metalaxyl 已证明有效,但对抗性真菌菌株的潜力构成了未来的威胁.

    更多相关视频

    Investigation of a Blue Light LED Device to Suppress Wound Pathogens Using a Collagen-Based Synthetic Skin Model
    08:56

    Investigation of a Blue Light LED Device to Suppress Wound Pathogens Using a Collagen-Based Synthetic Skin Model

    Published on: February 24, 2026

    Colletotrichum fioriniae Development in Water and Chloroform-based Blueberry and Cranberry Floral Extracts
    12:32

    Colletotrichum fioriniae Development in Water and Chloroform-based Blueberry and Cranberry Floral Extracts

    Published on: April 12, 2019

    相关实验视频

    Last Updated: Jul 12, 2026

    Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites
    09:39

    Production and Testing of Moisture Behavior and Thermal Properties of Rapeseed Straw and Ganoderma resinaceum Mycelium Bio-Composites

    Published on: September 5, 2025

    Investigation of a Blue Light LED Device to Suppress Wound Pathogens Using a Collagen-Based Synthetic Skin Model
    08:56

    Investigation of a Blue Light LED Device to Suppress Wound Pathogens Using a Collagen-Based Synthetic Skin Model

    Published on: February 24, 2026

    Colletotrichum fioriniae Development in Water and Chloroform-based Blueberry and Cranberry Floral Extracts
    12:32

    Colletotrichum fioriniae Development in Water and Chloroform-based Blueberry and Cranberry Floral Extracts

    Published on: April 12, 2019

    结论:

    • 由于真菌耐药性的快速演变,对烟草蓝菌的有效和可持续控制具有挑战性.
    • 目前的管理策略不足以防止广泛的作物损害.
    • 涉及科学家,政府和行业的国际合作努力对于开发足够的长期解决方案来解决蓝色菌问题至关重要.