Portal Of Entry
Portal Of Entry - Related Videos
01:27
Adjusting Entries
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2025
In accounting, a business's economic activities are segmented into designated time intervals, typically monthly, quarterly, or annually, known as accounting periods. This segmentation facilitates consistent tracking, summarization, and reporting of financial data, enabling stakeholders to accurately evaluate a company's performance and financial position. Companies must incorporate adjusting entries at the close of each period to ensure that financial reports conform to the accrual basis of...
07:39
Isolation of Rat Portal Fibroblasts by In situ Liver Perfusion
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Cited by 22 •
2012
A technique for isolating portal fibroblasts from rat liver is described. Livers are perfused and digested in situ with collagenase, followed by ex vivo digestion of the liver slurry and size selection of cells. This method provides a pure population of portal fibroblasts without the need for passage in culture.
01:22
Portal Hypertension
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2026
Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
05:15
Portal Vein Injection: A Method to Study Cancer Metastasis to the Liver
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2023
This video describes a surgical procedure to deliver mammary tumor cells to the murine liver via portal vein injection. This model permits the investigation of late stages of liver metastasis.
09:29
Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds
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Cited by 45 •
2015
Here, we present a protocol that examines specific steps of the viral entry to identify and evaluate novel antiviral agents.
FAQs
At the point of exposure, a pathogen must do more than reach a body surface. It may need to overcome physical and chemical barriers, adhere to host tissues, and then initiate invasion or colonization. These steps help explain why exposure does not automatically produce infection and why the earliest host-pathogen interactions are important in clinical microbiology.
The route involved can help connect an exposure with the body site first challenged by the pathogen. Respiratory, gastrointestinal, and genitourinary mucosae present different surfaces, while damaged skin and parenteral exposure represent other access points. Recognizing that distinction helps clinicians interpret clinical patterns and relate them to likely transmission and infection risks.
Physical and chemical barriers influence whether a pathogen can establish itself after exposure. If those defenses are overcome, adhesion to host tissue may support colonization or invasion. The outcome therefore depends not only on the access route, but also on the interaction between the pathogen, the contacted tissue, and the susceptibility of the host.
Clinicians can begin by asking which body surface or exposure route was most plausibly involved, then assess the associated infection risk. They can use that assessment to interpret the clinical pattern and choose prevention strategies aimed at the earliest stage of infection. This approach links microbiological reasoning with practical infection-control decisions.
Hand hygiene and vaccination are examples of preventive measures that can be selected after considering how exposure may occur. Hand hygiene can address opportunities for transfer, while vaccination supports prevention before infection is established. Their relevance lies in interrupting transmission or susceptibility at an early point, rather than waiting for invasion or colonization to develop.
During an epidemiological investigation, identifying the likely entry route helps organize evidence about transmission and infection risk. Investigators can compare the suspected portal with clinical patterns and exposures among affected individuals, then use the findings to develop strategies that interrupt infection early. This makes the concept useful beyond individual care, particularly for tracking and controlling infectious disease.