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Related Concept Videos

Primary Production01:06

Primary Production

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The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Primary Active Transport01:47

Primary Active Transport

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
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Primary Active Transport01:29

Primary Active Transport

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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Primary and Secondary Growth in Roots and Shoots03:02

Primary and Secondary Growth in Roots and Shoots

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Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
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Primary Distribution01:28

Primary Distribution

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Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.
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Nomenclature of Primary Amines01:17

Nomenclature of Primary Amines

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Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.
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Related Experiment Video

Updated: Feb 9, 2026

Evaluating the Function of the Foot Core System in the Elderly
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Primary intracranial neoplasms in the elderly.

M H Werner1, S C Schold

  • 1Division of Hematology and Oncology, Duke University Medical Center, Durham, North Carolina.

Clinics in Geriatric Medicine
|November 1, 1987
PubMed
Summary

Common brain tumors in older adults include metastasis, glioma, and meningioma. Early diagnosis and treatment with corticosteroids, surgery, radiation, or chemotherapy improve patient prognosis.

Area of Science:

  • Neurology
  • Oncology

Background:

  • Brain tumors are a significant health concern in the elderly population.
  • Common types include metastatic tumors, gliomas, meningiomas, pituitary adenomas, and acoustic neuromas.

Purpose of the Study:

  • To summarize the common types of brain tumors in the elderly.
  • To outline diagnostic methods and treatment strategies.
  • To emphasize the importance of early diagnosis for patient outcomes.

Main Methods:

  • Review of common brain tumor types in the elderly.
  • Discussion of diagnostic tools, primarily CT scans.
  • Overview of treatment modalities including corticosteroids, surgery, radiation, and chemotherapy.

Main Results:

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  • Metastasis, glioma, meningioma, pituitary adenoma, and acoustic neuroma are the most frequent brain tumors in elderly patients.
  • Neurologic symptoms are common presentations.
  • CT scans are effective for diagnosis.

Conclusions:

  • Effective treatment options exist for elderly brain tumor patients.
  • Prognosis is influenced by tumor histology, location, and patient tolerance to therapy.
  • Timely diagnosis is crucial for successful treatment and improved prognosis.