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Related Concept Videos

Weak Base Solutions03:21

Weak Base Solutions

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Testosterone: Functions and Regulation01:26

Testosterone: Functions and Regulation

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The intricate hormonal interplay essential for male reproductive health begins with the release of gonadotropin-releasing hormone (GnRH) by the hypothalamus. This hormone prompts the pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). LH targets the Leydig cells in the testes, stimulating them to produce and release testosterone. In concert with testosterone, FSH acts on the Sertoli cells within the seminiferous tubules to facilitate the release of...
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Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

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Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
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Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

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Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
49.4K
Crossed Aldol Reaction Using Weak Bases01:14

Crossed Aldol Reaction Using Weak Bases

2.7K
This lesson deals with the crossed aldol reaction using weak bases. The self-condensation of an aldehyde having α hydrogen is prevented by adding it slowly to a mixture of formaldehyde and weak bases like hydroxide and alkoxide. Upon slow addition of the aldehyde, the base deprotonates the α carbon of the aldehyde to form the corresponding enolate. The enolate subsequently attacks the formaldehyde to form a single crossed product. Figure 1 depicts the aforementioned reaction.
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Combining Behavioral Endocrinology and Experimental Economics: Testosterone and Social Decision Making
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Testosterone Deficiency, Weakness, and Multimorbidity in Men.

Mark D Peterson1, Aleksandr Belakovskiy2, Ryan McGrath3

  • 1Department of Physical Medicine & Rehabilitation, Michigan Medicine, University of Michigan, Ann Arbor, USA. mdpeterz@med.umich.edu.

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Summary

Low total testosterone (TT) is linked to higher rates of multimorbidity in men across all ages. This association is particularly pronounced in young and older men with TT deficiency and weakness.

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Area of Science:

  • Endocrinology and Andrology
  • Gerontology and Geriatrics
  • Public Health and Epidemiology

Background:

  • Testosterone plays a crucial role in male health and physiological functions.
  • Low testosterone levels (hypogonadism) are increasingly recognized as a potential factor in various health conditions.
  • The relationship between testosterone deficiency and multimorbidity requires further investigation across different age groups.

Purpose of the Study:

  • To evaluate the association between total testosterone (TT) deficiency and the presence of multimorbidity in men.
  • To examine the prevalence of multimorbidity in relation to testosterone levels across young, middle-aged, and older men.
  • To determine the independent association of low testosterone and weakness with multimorbidity.

Main Methods:

  • Cross-sectional analysis of men examining multimorbidity prevalence based on testosterone deficiency status.
  • Multivariate logistic regression models were used to assess the association between age-specific TT tertiles and multimorbidity.
  • Secondary analysis adjusted for sociodemographic variables, obesity, and grip strength (NGS) to confirm independent associations.

Main Results:

  • Multimorbidity was significantly more prevalent in men with testosterone deficiency (55.2%) compared to those with normal TT (36.6%).
  • This difference was prominent in young (36.4% vs 13.5%) and older men (75.0% vs 61.5%) with testosterone deficiency.
  • Low TT and moderate TT tertiles showed robust associations with multimorbidity, even after adjusting for covariates including weakness.

Conclusions:

  • Total testosterone deficiency is independently associated with a higher prevalence of multimorbidity in men.
  • The association between testosterone deficiency and multimorbidity is evident across all adult age groups, with notable impact in younger and older populations.
  • Low testosterone and weakness are significant risk factors for multimorbidity, highlighting the importance of assessing hormonal status in men's health.