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Population density metric
Physiological density, also known as real population density[citation needed], is defined as the number of people per unit area of arable land. It provides
Physiological_density
This is a list of countries ordered by physiological density. "Arable land" is defined by the UN's Food and Agriculture Organization, the source of "Arable
List of countries by arable land density
List_of_countries_by_arable_land_density
Measurement of population size per unit area or unit volume
measures of population density over a specific area. Arithmetic density: The total number of people / area of land Physiological density: The total population
Population_density
One of the five major groups of lipoprotein
ULDL by the overall density naming convention), very low-density lipoprotein (VLDL), intermediate-density lipoprotein (IDL), low-density lipoprotein (LDL)
Low-density_lipoprotein
Mass per unit area
The area density (also known as areal density, surface density, superficial density, column density, or density thickness) of a two-dimensional object
Area_density
Academic journal
population Population biology Population decline Population density Physiological density Population dynamics Population model Population pyramid Population
Population and Development Review
Population_and_Development_Review
Academic journal
population Population biology Population decline Population density Physiological density Population dynamics Population model Population pyramid Population
Population_and_Environment
Physiological phenomenon involving the engorgement of the clitoris
erection (also known as clitoral tumescence or female erection) is a physiological phenomenon where the clitoris becomes enlarged and firm. Clitoral erection
Clitoral_erection
individual physiological characteristics. The interaction between different energy systems captures the essence of why certain physiological characteristics
Physiology_of_marathons
Number of individual plants present per unit of ground area
Plant density is the number of individual plants present per unit of ground area. It is most easily interpreted in the case of monospecific stands, where
Plant_density
Village in Kendrapada, Odisha, India
population Population biology Population decline Population density Physiological density Population dynamics Population model Population pyramid Population
Panki,_Kendrapada
Village in Stavropol, Russia
population Population biology Population decline Population density Physiological density Population dynamics Population model Population pyramid Population
Krymgireevskoye
Skeletal disorder
rate of resorption exceeds that of bone formation, causing bones to lose density and become more susceptible to fractures. The word "osteoporosis" is from
Osteoporosis
Adaptations of marine vertebrates to diving
The physiology of underwater diving is the physiological adaptations to diving of air-breathing vertebrates that have returned to the ocean from terrestrial
Physiology of underwater diving
Physiology_of_underwater_diving
Exercise strategy
MJ (1 May 2017). "Physiological adaptations to interval training and the role of exercise intensity". The Journal of Physiology. 595 (9): 2915–2930
High-intensity interval training
High-intensity_interval_training
Study of human body movement
the scientific study of human body movement. Kinesiology addresses physiological, anatomical, biomechanical, pathological, neuropsychological principles
Kinesiology
Species of grass
Analysis of natural variation in Bermuda grass (Cynodon dactylon) reveals physiological responses underlying drought tolerance. PLoS ONE. 2012;7(12):e53422
Cynodon_dactylon
Area perpendicular to fiber direction
In muscle physiology, physiological cross-sectional area (PCSA) is the area of the cross section of a muscle perpendicular to its fibers, generally at
Physiological cross-sectional area
Physiological_cross-sectional_area
Inhalational anaesthetic
C4H3F7O Molar mass 200.056 g·mol−1 3D model (JSmol) Interactive image Density 1.53 g/cm3 Boiling point 58.5 °C (137.3 °F) SMILES FC(F)(F)C(OCF)C(F)(F)F
Sevoflurane
Influences of the underwater environment on the physiology of human divers
Human physiology of underwater diving is the physiological influences of the underwater environment on the human ambient pressure diver, and adaptations
Human physiology of underwater diving
Human_physiology_of_underwater_diving
Overview of the process or technique of tattooing
first-degree or second-degree burns or distortions in the image. The type and density of the ink as well as shape of the tattoo may increase the risk, particularly
Process_of_tattooing
Subdiscipline of botany
Lambers, H. (1998). Plant physiological ecology. New York: Springer-Verlag. ISBN 0-387-98326-0. Larcher, W. (2001). Physiological plant ecology (4th ed.)
Plant_physiology
Manometric unit of pressure
exerted by a column of mercury 1 millimetre high with a density of 13595.1 kg/m3 (approximate density at 0 °C or 32 °F) at standard gravity (9.80665 m/s2)
Millimetre_of_mercury
Biochemical assembly for transporting hydrophobic lipid molecules
inflammatory process. When the body is functioning under normal, stable physiological conditions, HDL has been shown to be beneficial in several ways. LDL
Lipoprotein
Total mass of fat divided by total body mass
and variation of fat-free mass density: a cellular-level body composition modeling study". American Journal of Physiology. Endocrinology and Metabolism
Body_fat_percentage
Mammalian protein found in Homo sapiens
The low-density lipoprotein receptor (LDL-R) is a mosaic protein of 839 amino acids (after removal of 21-amino acid signal peptide) that mediates the
LDL_receptor
Probability distribution
for a real-valued random variable. The general form of its probability density function is f ( x ) = 1 2 π σ 2 exp ( − ( x − μ ) 2 2 σ 2 ) . {\displaystyle
Normal_distribution
Genus of woodlice
(2024-04-30). "Inconsistent effects of environmental variations on body size and density of pillbugs, Armadillidium vulgare (Latreille, 1804) (Isopoda, Oniscidea)
Armadillidium
2026 American crewed spaceflight to the ISS
include autonomous ultrasound scans, synchronized physiological sensors, and measuring bone density and blood flow, as well as monitoring and preventing
SpaceX_Crew-12
Natural capability to produce offspring
likely a better predictor. Population density is often observed to negatively affect fecundity, making fecundity density-dependent. The reasoning behind this
Fecundity
Diagnostic test for bone mineral density testing
(DXA or DEXA; also BMD test, bone density test, bone densitometry, p-DEXA) is a means of measuring bone mineral density (BMD) with spectral imaging. Two
Dual-energy X-ray absorptiometry
Dual-energy_X-ray_absorptiometry
Difficulty experienced by humans during any stage of normal sexual activity
of sexual excitement and pleasure in sexual activity. There may be physiological origins to these disorders, such as decreased blood flow or lack of
Sexual_dysfunction
Magnitude or dimension of a thing
Size can also be measured in terms of mass, especially when assuming a density range. In mathematical terms, "size is a concept abstracted from the process
Size
Physical and chemical properties of pure water
density than liquid water, such as ice II, ice III, high-density amorphous ice (HDA), and very-high-density amorphous ice (VHDA). The unusual density
Properties_of_water
Substance that an organism uses to live
amounts (milligrams or micrograms); they have subtle biochemical and physiological roles in cellular processes, like vascular functions or nerve conduction
Nutrient
Using body fats as fuel instead of carbohydrates
bodies in the blood or urine. Physiological ketosis is a normal response to low glucose availability. In physiological ketosis, ketones in the blood are
Ketosis
Range of light usable for photosynthesis
surface for a specified amount of time, or the Photosynthetic Photon Flux Density (PPFD). Values of PPFD are normally expressed using units of mol⋅m−2⋅s−1
Photosynthetically active radiation
Photosynthetically_active_radiation
Physiological responses to immersion of air-breathing vertebrates
known as the diving response and mammalian diving reflex, is a set of physiological responses to immersion that overrides the basic homeostatic reflexes
Diving_reflex
Chemical term for density of a component in a mixture
concentration equals its density (mass divided by volume); thus the mass concentration of a component in a mixture can be called the "density of a component in
Mass concentration (chemistry)
Mass_concentration_(chemistry)
that smaller species had a higher average density compared to larger species, which had a lower average density. Bertozzo et al. (2025) identify damage
2025 in archosaur paleontology
2025_in_archosaur_paleontology
Gas layer surrounding Earth
Martin, Daniel; et al. (2016). "The human physiological impact of global deoxygenation". The Journal of Physiological Sciences. 67 (1): 97–106. doi:10.1007/s12576-016-0501-0
Atmosphere_of_Earth
Salt water for medical purposes
referred to as physiological saline or isotonic saline (because it is approximately isotonic to blood serum, which makes it a physiologically normal solution)
Saline_(medicine)
In plants, a variable pore between paired guard cells
cells is reversed by green light, which isomerizes zeaxanthin. Stomatal density and aperture (length of stomata) varies under a number of environmental
Stoma
Variation in the time intervals between heartbeats
Heart rate variability (HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in
Heart_rate_variability
Species of crustacean
BugGuide.net. Retrieved 2019-09-23. Lazo- Wasem, Eric A. (1984-05-01). "Physiological and Behavioral Ecology of the Terrestrial Amphipod Arcitalitrus Sylvaticus
Arcitalitrus_sylvaticus
Fluid-filled space in organs
and lymph formation and transport: physiological regulation and roles in inflammation and cancer". Physiological Reviews. 92 (3): 1005–1060. doi:10.1152/physrev
Interstitium
katana was tested first against three tatami bamboo mats (with the same density as human bone), and managed to cut them all in one clean swipe in under
List of Deadliest Warrior episodes
List_of_Deadliest_Warrior_episodes
Electrophysiological method to record electrical activity of the brain
but not maternal hair cortisol concentration (a marker of longer-term physiological stress), was associated with infant theta and alpha power at one month
Electroencephalography
Princeton University and physicist Alan Guth of MIT, and the universe's density parameter Ω, calculated from the Friedmann equations; Mexican Carlos Frenk
List_of_Equinox_episodes
Prefecture of Japan
area of 5,172.92 square kilometres (1,997.28 sq mi) with a population density of 1,442 inhabitants per square kilometre (3,730/sq mi). Aichi Prefecture
Aichi_Prefecture
and the University of New Mexico to Demonstrate Laser Cooling for High Density Processors". Maxwell Labs. 8 April 2025. Retrieved 14 April 2025. "MPEC
2025_in_science
Species of bird
143..456P. doi:10.1046/j.1439-0361.2002.02039.x. Bahat, O. (1995). Physiological adaptations and foraging ecology of an obligatory carrion eater - the
Eurasian_griffon_vulture
Law of electrical current and voltage
{\displaystyle \mathbf {J} =\sigma \mathbf {E} ,} where J is the current density at a given location in a resistive material, E is the electric field at
Ohm's_law
Bloomsburg, Pennsylvania, US "for their discoveries concerning the primary physiological and chemical visual processes in the eye" 1967 George Wald New York
List of American Nobel laureates
List_of_American_Nobel_laureates
Audible vibration that travels via pressure waves in matter
wave of pressure or related quantities (e.g. displacement), whereas in physiological-psychological contexts it implies a hearing process. Though sensitivity
Sound
Base pairs in molecular genetics
Dickerson followed by several other groups, solved structures of the physiological double helical B-DNA with a complete helical turn, based on the crystals
Non-canonical_base_pairing
Equilibrium between buoyancy and weight of an immersed object
Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force
Neutral_buoyancy
German psychologist and author
myofascial tissue samples are sufficient for quantification of myofibroblast density". Clinical Anatomy. 31 (3): 368–372. doi:10.1002/ca.23040. PMID 29314236
Robert_Schleip
Behaviour of charged particles near a semi-permeable membrane
(ICP). Negatively charged molecules within cells create a fixed charge density, which increases intracranial pressure through the Donnan effect. ATP pumps
Gibbs–Donnan_effect
Drive to eat for pleasure rather than sustenance
beverages than fruit juice, and was equal with low-energy-density yogurt with inulin and high-energy-density yogurt. People with high PFS scores may do better
Hedonic_hunger
Void between celestial bodies
and between celestial bodies. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum of predominantly hydrogen and helium
Outer_space
Provision to cells and organisms to support life
Nutrition is the biochemical and physiological process by which an organism uses food and water to support its life. The intake of these substances provides
Nutrition
Highest velocity attainable by a falling object
Pattarini, James M.; Law, Jennifer; Clark, Jonathan B. (February 2014). "Physiological Monitoring and Analysis of a Manned Stratospheric Balloon Test Program"
Terminal_velocity
Chemical compound
then converts the alcohol to the alkyl nitrite, which, due to its low density, will form an upper layer that can be easily decanted from the reaction
Amyl_nitrite
Sexual dimorphism in human physiology refers to the distinct physiological characteristics associated with either male or female humans. These differences
Sexual dimorphism in human physiology
Sexual_dimorphism_in_human_physiology
Science Fiction Novel Series
that prey can repopulate extensively hunted areas. Quintaglio population density is kept fairly low for this reason, and also due to the culling of egglings
Quintaglio_Ascension_Trilogy
Species of bird
eagle (Aquila verreauxii). Although never common, greater population densities do exist in southern Africa and in some parts of east Africa. Martial
Martial_eagle
Biological tissue that allows movement
enzyme-histochemical and physiological properties of a novel fast-twitch motor unit type". The American Journal of Physiology. 261 (1 pt 1): C93–101. doi:10
Muscle
16-Carbon fatty acid
Claudia Manca (2017). "Palmitic Acid: Physiological Role, Metabolism and Nutritional Implications". Frontiers in Physiology. 8: 902. doi:10.3389/fphys.2017
Palmitic_acid
them as possible fossils of red algae. Mccandless & Droser (2026) study density and abundance of algae from the Nilpena Fossil Site within the Nilpena
2026_in_paleobotany
Equipment which allows the user to breathe at hypoxic altitudes
altitude, from 1,500 to 3,500 metres (4,900 to 11,500 ft) there are physiological effects of the reduced oxygen partial pressure, which include reduced
High-altitude breathing apparatus
High-altitude_breathing_apparatus
Curie 1904 Lord Rayleigh United Kingdom "For his investigations of the densities of the most important gases and for his discovery of argon in connection
List of Nobel laureates in Physics
List_of_Nobel_laureates_in_Physics
Earth, a natural material
have a dry bulk density (density of soil taking into account voids when dry) between 1.1 and 1.6 g/cm3, though the soil particle density is much higher
Soil
Athletics event
increases during a race, and the amount of hemoglobin in the blood. Other physiological factors affecting a marathon runner's aerobic capacity include pulmonary
Long-distance_running
Reduced reaction to a drug following repeated use
development is reversible (e.g., through a drug holiday) and can involve both physiological factors and psychological factors. Tolerance can occur with drugs taken
Drug_tolerance
Phenomenon in which the crowns of fully stocked trees do not touch each other
that it might inhibit spread of leaf-eating insect larvae. The exact physiological basis of crown shyness is uncertain. The phenomenon has been discussed
Crown_shyness
Physiological structure of birds' bodies
Bird anatomy, or the physiological structure of birds' bodies, shows many unique adaptations, mostly aiding flight. Birds have a light skeletal system
Bird_anatomy
Indian defense projects under DRDO
ICW hard armour panels (HAPs) and standalone HAPs have respective areal densities of less than 40 kg/m2 and 43 kg/m2. DRDO Industry Academia Centre of Excellence
Projects_of_DRDO
Species of rodent
in chronic social interactions and physiological states in female rat-like hamsters (Tscheskia triton)". Physiology & Behavior. 89 (3): 420–427. doi:10
Greater_long-tailed_hamster
Concept relating to waves and signals
based on their characteristic electromagnetic spectra. The spectral flux density is used to represent the spectrum of a light-source, such as a star. In
Spectrum_(physical_sciences)
C2HCl3, widely used industrial solvent
(NIOSH). Venkatesulu D, Venkatesu P, Rao MV (1997). "Viscosities and Densities of Trichloroethylene or Tetrachloroethylene with 2-Alkoxyethanols at 303
Trichloroethylene
("lie detection") – is an interrogation method which measures several physiological indicators while the subject answers a series of questions. The belief
List_of_pseudoscience_topics
First hominin expansion into Eurasia (2.1–0.1 Ma)
having evolved alongside them. The higher an African ape's population density, the better a disease fares. 55% of chimps at the Gombe reserve die of
Early expansions of hominins out of Africa
Early_expansions_of_hominins_out_of_Africa
Variation in electrical response of the skin
nervous system, and skin conductance is an indication of psychological or physiological arousal. If the sympathetic branch of the autonomic nervous system is
Electrodermal_activity
Potassium compound and alternative to salt
alongside nitrogen and phosphorus. Potassium is required for plant physiological processes including enzyme activation, photosynthesis, protein synthesis
Potassium_chloride
Medicine preventing a biological response
pharmacokinetic, receptor and physiological antagonism. The four mechanisms are widely used in reducing overstimulated physiological actions. Drug antagonists
Drug_antagonism
In vitro fertilization procedure
from the most common techniques of in vitro sperm capacitation (swim-up, density gradients, filtration and simple wash), some new techniques are useful
Intracytoplasmic sperm injection
Intracytoplasmic_sperm_injection
State / Characteristics of Vacuum Tubes / Color / Cosmic Rays / Density and Weight Density: Laboratory / Diffraction and Interference / Discovery of the
List of Encyclopædia Britannica Films titles
List_of_Encyclopædia_Britannica_Films_titles
Genus of antelopes found in Africa
Dik-diks have special physiological adaptations to help them survive in arid environments. For instance, dik-diks have a lower density of sweat glands compared
Dik-dik
Study of the energy cost of running
given speed. This variability has led to the study of biomechanical or physiological factors that may be predictive of the energy cost to run both between
Running_energetics
Equipment allowing or assisting the user to breathe in a hostile environment
sum of the physiological work of breathing and the mechanical work of breathing of the apparatus. In a normal resting state the physiological work of breathing
Breathing_apparatus
Temporary or permanent loss of hearing due to exposure to sound
of Temporary and Permanent Noise-Induced Hearing Loss on Neuronal Cell Density in the Mouse Central Auditory Pathway". Journal of Neurotrauma. 27 (8)
Auditory_fatigue
Class of enzymes which cleave fats via hydrolysis
remaining lipids carried on lipoproteins in the blood to regenerate LDL (low density lipoprotein). Hepatic lipase deficiency lipoprotein lipase LPL or "LIPD"
Lipase
Evolutionary process
ecological niches. The adaptive traits may be structural, behavioural or physiological. Structural adaptations are physical features of an organism, such as
Adaptation
Assisted reproductive technology procedure
appear to influence blastocyst development or blastocyst morphology. Physiological intracytoplasmic sperm injection (PICSI) is a variation of ICSI that
In_vitro_fertilisation
Accelerator Laboratory John Perdew (born 1943) United States "for advances in density functional theory of electronic structure, revealing 'nature's glue'."
List of Clarivate Citation laureates in Physics
List_of_Clarivate_Citation_laureates_in_Physics
Formation of blood vessels
Vascularisation is the physiological process through which blood vessels form in tissues or organs. Neovascularization (neo- + vascular + -ization) specifically
Vascularisation
Chemical compound and greenhouse gas
nonpolar organic solvents. It has a density of 6.12 g/L at sea level conditions, considerably higher than the density of air (1.225 g/L). It is generally
Sulfur_hexafluoride
Species of sunflower native to eastern North America
ISBN 978-1-59921-887-8. OCLC 560560606. Smith, James Edward (1807). An introduction to physiological and systematical botany . p. 108f. A change, one presumes, of the Italian
Jerusalem_artichoke
fed fruits and vegetables. He could not leave the cabin and made his physiological needs at a urinal, on which he also received the water to wash himself
List of kidnappings (1990–1999)
List_of_kidnappings_(1990–1999)
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PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
PHYSIOLOGICAL DENSITY
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