関連する実験動画
Updated: Jun 30, 2026

07:57
Necropsy-based Wild Fish Health Assessment
Published on: September 11, 2018
白水カヌーの健康への影響
L Fewtrell1, A F Godfree, F Jones
1Centre for Research into Environment and Health, University of Wales, Lampeter, UK.
Lancet (London, England)
|June 27, 1992
まとめ
淡水のレクリエーション活動は病気につながる可能性があります. 高濃度の腸内ウイルスおよび大腸菌の糞便を含む水域でのカヌー走行は,消化器系および呼吸器系症状を著しく増加させ,下水汚染のリスクを示唆しています.
科学分野:
- 環境微生物学 環境微生物学
- 公衆衛生は公衆衛生である.
- エピデミオロジー エピデミオロジー
背景:
- 淡水の質とレクリエーション活動による病気率との関連に関する定量的なデータは限られている.
- 汚染された水へのレクリエーション的曝露は,公衆衛生上の潜在的なリスクをもたらします.
研究 の 目的:
- 微生物の汚染レベルが異なる淡水環境でのレクリエーション用カヌーの健康への影響を評価する.
- 水媒介の病原体とカヌー乗り者の病気発生率との関係を決定する.
主な方法:
- 白水とスラロムのカヌー選手を対象に,異なる微生物汚染レベルを持つ2つのサイトで,前向きなコホート研究が行われました.
- 水のサンプルをエンテロウイルスと糞便の大腸菌に分析した.
- カヌー乗りの健康症状は,暴露後5〜7日後にモニタリングされ,対照群と比較されました.
主要な成果:
- サイトAはエンテロウイルス濃度が高く,糞便コリフォーム濃度が中等であったが,サイトBと比較してカヌー乗り者の間で胃腸および上呼吸器系の症状の発生率が著しく高かった.
- サイトAに曝されたカヌー乗員は,サイトBや非曝露の観客よりも多くの病気を経験しました.
- 淡水の微生物汚染の上昇は,病気の発症率の増加と直接関連していました.
結論:
- 淡水のレクリエーション活動は,海水と同様に,下水汚染による病気につながる可能性があります.
- ウイルスの濃度は,バクテリアの数よりも淡水の健康上の危険性のより正確な指標である可能性があります.
- 公衆衛生に関する勧告は,淡水レクリエーションのリスク評価において,ウイルスによる汚染を考慮すべきである.
さらに関連する動画
14:06Rapid Testing of Resistance of Timber to Biodegradation by Marine Wood-Boring Crustaceans
Published on: January 29, 2022
06:45Effect of Yi-Nao-Jie-Yu Prescription on Post-Stroke Depression in Rats using Middle Cerebral Artery Occlusion Combined with Behavioral Restraint
Published on: January 9, 2026
関連する概念動画
Introduction to Wood
Wood, derived from trees, is a versatile and widely used construction material. Trees feature a trunk surrounded by a protective layer of dead bark. Beneath this outer layer lies the living bark, followed by the cambium, and then the sapwood which transitions into heartwood as it matures. At the center of the trunk is the pith. The age of a tree can be discerned by examining its growth rings, which are concentric bands visible in the trunk's cross-section.
The structural integrity of the wood...
The structural integrity of the wood...
Wood Surfacing
Wood surfacing is a critical finishing process designed to smoothen the wood surface, enhance its dimensional accuracy, and make handling safer. This process compensates for potential shrinkage during the seasoning phase by marginally increasing the wood dimensions before surfacing. It also helps correct some distortions that may occur as the wood dries.
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
The equipment used in the surfacing process is a plane equipped with rotating blades. This tool efficiently smoothens the wood surface and can...
Lumber Defects
Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...
Quality of Water
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...