Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Factors Influencing Microbial Growth: pH

Factors Influencing Microbial Growth: pH

Microorganisms are classified as acidophiles, neutrophiles, or alkaliphiles based on their pH growth preferences, reflecting their adaptations to specific environments. Maintaining a stable intracellular pH is critical for macromolecular stability and enzymatic activity, which can be challenged by external pH variations.Neutrophiles, such as Escherichia coli, grow optimally between pH 5.5 and 8.0. These microorganisms inhabit neutral or slightly acidic environments and employ mechanisms like...

Microbiota of the Stomach and Small Intestine

Microbiota of the Stomach and Small Intestine

The human gastrointestinal (GI) tract is characterized by distinct physicochemical conditions that shape its microbial communities. Among these, the stomach presents a particularly challenging environment for microbial colonization due to its highly acidic pH, ranging from 1 to 3. This extreme acidity effectively limits microbial density. However, certain acid-tolerant microorganisms are capable of surviving in this niche. Notably, Helicobacter pylori can colonize the gastric mucosa,...

Peptic Ulcer

Peptic Ulcer

Peptic ulcers are erosive lesions of the gastric or duodenal lining, most commonly caused by Helicobacter pylori infection. This Gram-negative, helical bacterium has adapted to survive the stomach’s acidic environment by producing urease, which converts urea into ammonia and carbon dioxide. The ammonia neutralizes gastric acid in the bacterium’s immediate environment, allowing colonization of the gastric mucosa. H. pylori attaches to mucus-secreting epithelial cells, penetrates the mucus...

Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH

Factors Affecting Dissolution: Drug pKa, Lipophilicity and GI pH

Drug absorption within the gastrointestinal (GI) tract is a complex process influenced by several critical factors, including the site pH, the drug's dissociation constant (pKa), and the drug's lipophilicity. The GI tract exhibits a pH gradient, with an acidic environment in the stomach and a more alkaline environment in the small intestine. This pH variation directly affects the ionization state of drugs.
A drug's pKa and the pH of the gastrointestinal (GI) tract play crucial roles in drug...

Factors Influencing Microbial Growth: Osmolarity

Factors Influencing Microbial Growth: Osmolarity

Osmolarity is the measure of solute concentration in a solution. It plays a critical role in determining water availability for organisms. Water moves across semipermeable membranes through osmosis, flowing from regions of lower solute concentration (more dilute) to regions of higher solute concentration (more concentrated).In high-solute environments, microbial cells lose water, leading to dehydration and inhibited growth. The extent to which water is available to microbes in such environments...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Randomised prospective study compares efficacy of five different stomach tubes for rumen fluid sampling in dairy cows.

The Veterinary record·2014

Same author

[Measures to improve the health situation of patients with rare diseases in Germany. A comparison with the National Action Plan].

Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz·2014

Same author

Is mesenteric panniculitis truely a paraneoplastic phenomenon? A matched pair analysis.

European journal of radiology·2013

Same author

Automatic bone and plaque removal using dual energy CT for head and neck angiography: feasibility and initial performance evaluation.

European journal of radiology·2009

Same author

Accuracy of dual-source CT in the characterisation of non-calcified plaque: use of a colour-coded analysis compared with virtual histology intravascular ultrasound.

The British journal of radiology·2009

Same author

Dual-energy CT for the characterization of urinary calculi: In vitro and in vivo evaluation of a low-dose scanning protocol.

European radiology·2009

Search research articles

Related Experiment Video

Updated: May 20, 2026

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

Published on: September 7, 2015

Factors associated with ruminal pH at herd level.

T Geishauser¹, N Linhart, A Neidl

¹tgeishauser@sentex.net

Journal of Dairy Science

|July 24, 2012

Summary

Dairy cow ruminal pH is influenced by diet concentrate levels, days in milk, and milk yield. These factors, along with time of day, significantly impact herd-level ruminal pH dynamics.

Area of Science:

Animal Science
Dairy Cattle Nutrition
Ruminant Physiology

Background:

Ruminal pH is a critical indicator of digestive health in dairy cows.
Understanding factors influencing ruminal pH is essential for optimizing herd health and productivity.

Purpose of the Study:

To investigate herd-level factors associated with ruminal pH in dairy cows.
To identify key dietary and management variables affecting ruminal pH.

Main Methods:

Rumen fluid samples were collected from 432 dairy cows prior to claw trimming.
Rumen fluid pH, volume, lactation number, concentrate percentage, days in milk (DIM), time of day, and daily milk yield were recorded.

Main Results:

Ruminal pH decreased with higher concentrate percentages in the ration.

More Related Videos

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure

Published on: July 19, 2018

Equine Enteric Glial Culture and Application to the Study of a Neural Inflammatory Mechanism in Equine Colic

Equine Enteric Glial Culture and Application to the Study of a Neural Inflammatory Mechanism in Equine Colic

Published on: October 4, 2024

Related Experiment Videos

Last Updated: May 20, 2026

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

The Use of an Automated System (GreenFeed) to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

Published on: September 7, 2015

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure

Lab-Scale Model to Evaluate Odor and Gas Concentrations Emitted by Deep Bedded Pack Manure

Published on: July 19, 2018

Equine Enteric Glial Culture and Application to the Study of a Neural Inflammatory Mechanism in Equine Colic

Equine Enteric Glial Culture and Application to the Study of a Neural Inflammatory Mechanism in Equine Colic

Published on: October 4, 2024

Ruminal pH showed a dynamic pattern related to days in milk, decreasing post-calving and increasing later.

Time of day influenced ruminal pH, with peaks in the morning and afternoon.

Increased daily milk yield was associated with lower ruminal pH.

Lactation number and daily milk yield showed an interaction affecting ruminal pH.

Conclusions:

Dietary concentrate levels, days in milk, time of day, and daily milk yield are significant herd-level factors influencing ruminal pH.
These findings provide insights for managing dairy cow nutrition and health to maintain optimal ruminal pH.