SPATIAL DISTRIBUTION OF BIOPOTENTIALS AND THEIR SOURCES IN BRAIN STRUCTURES IN alcohol-dependent patients WITH COMORBID AFFECTIVE DISORDER

ABSTRACTModeling of structural brain variation over the lifespan is important to better understand factors contributing to healthy aging and risk for neurological conditions such as Alzheimer’s disease. Even so, we lack normative data on brain morphometry across the adult lifespan in large, well-powered samples. Here, in a large population-based sample of 26,440 adults from the UK Biobank (age: 44-81 yrs.), we created normative percentile charts for MRI-derived subcortical volumes. Next, we investigated associations between these morphometric measures and the strongest known genetic risk factor for late-onset Alzheimer’s disease (APOE genotype) and mapped the spatial distribution of age-by-sex interactions using computational surface mesh modeling and shape analysis. Vertex-wise shape mapping supplements traditional gross volumetric approaches to reveal finer-grained variations across functionally important brain subcompartments. Normative curves revealed volumetric loss with age, as expected, for all subcortical brain structures except for the lateral ventricles, which expanded with age. Surprisingly, no volumetric associations with APOE genotype were detected, despite the very large sample size. Age-related trajectories for volumes differed in women versus men, and surface-based statistical maps revealed the spatial distribution of the age-by-sex interaction. Subcortical volumes declined faster in men than women over the full age range, but after age 60, fewer structures showed sex-dependent trajectories, indicating similar volumetric changes in older men and women. Large-scale statistical modeling of age effects on brain structures may drive new insights into individual differences in brain aging and help to identify factors that promote healthy brain aging and risk for disease.

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Cognitive dysfunction and functional disability in alcohol-dependent adults with or without a comorbid affective disorder

Cognitive Neuropsychiatry ◽

10.1080/13546805.2015.1014031 ◽

2015 ◽

Vol 20 (3) ◽

pp. 222-231 ◽

Cited By ~ 7

Author(s):

Rico S.C. Lee ◽

Glenys Dore ◽

Lisa Juckes ◽

Tamara De Regt ◽

Sharon L. Naismith ◽

...

Keyword(s):

Affective Disorder ◽

Cognitive Dysfunction ◽

Functional Disability ◽

Alcohol Dependent

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Fibromyalgia: Relationship Between Pain and Mood

European Psychiatry ◽

10.1016/s0924-9338(09)71127-7 ◽

2009 ◽

Vol 24 (S1) ◽

pp. 1-1

Author(s):

A. Barreiro ◽

A. Arroita ◽

K. Ugarte ◽

A. Arnaiz ◽

A. Sarasola ◽

...

Keyword(s):

Psychiatric Disorders ◽

Affective Disorder ◽

Pain Perception ◽

Scientific Literature ◽

Brain Structures ◽

The Other ◽

Pain Mechanisms ◽

Hormonal Factors ◽

Comprehensive Review ◽

High Incidence

Introduction:Fibromyalgia is an entity with idiopathic etiology affecting 2-4% of population. It is a frequent cause of disability, its most usual symptoms being diffuse pain and fatigue. There is evidence that alterations in several chemical and hormonal factors could explain changes in pain perception mechanisms, accounting for some of the symptoms. However, the high incidence of comorbid psychiatric disorders tends to indicate there is an associated psychopathology in fibromyalgia patients, especially regarding affectivity. Some authors believe fibromyalgia could be considered an evolution of the concept of neurasthenia already defined by Beard in 1860.Materials and methods:Comprehensive review of the scientific literature (Medline, Psychoinfo, Medex) on fibromyalgia and pain mechanisms published over the last three years.Results:Mood regulation has been linked to pain perception through neurotransmitters and brain structures. Also, several studies state that depression changes the neuroendocrine, immune and processing regulation of pain.However, some researchers believe there is enough evidence for a psychiatric approach to fibromyalgia, as there is a relationship between depression and fibromyalgia. Thus, fibromyalgia could be considered an affective disorder.Conclusion:Current research does not clearly show whether pain precedes affective alteration or the other way round, or whether mood and pain depend on common mechanisms.

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Risk Factors and Chronicity of Bipolar Affective Disorder: Biological and Psychosocial Aspects

Counseling Psychology and Psychotherapy ◽

10.17759/cpp.2019270406 ◽

2019 ◽

Vol 27 (4) ◽

pp. 81-97

Author(s):

T.V. Dovzhenko ◽

D.M. Tsarenko ◽

T.Yu. Yudeeva

Keyword(s):

Risk Factors ◽

Affective Disorder ◽

Family Relationships ◽

Genetic Risk ◽

Bipolar Affective Disorder ◽

Brain Structures ◽

Epidemiological Studies ◽

Dysfunctional Family ◽

Spectrum Disorders ◽

Genetically Determined

The literature review provides the results of epidemiological studies of bipolar affective disorder (BAD). Biological risk factors and adverse course of BAD are considered in detail, including genetic ones (BAD is defined as a genetically determined disorder that has common non-specific genetic risk factors with depressive and schizophrenic spectrum disorders). We address the data on various neurotransmitter systems dysfunctions that may play a role in the pathogenesis of the disease. The results of studies of biological markers in the blood, as well as morphological disorders in brain structures, are analyzed. Stressful situations, that can aggravate manifestations of a genetic and biochemical predisposition, disturbances in emotional and cognitive mental processes, neurocognitive deficiency, and dysfunctional family relationships are considered as psychosocial factors of BAD.

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Lithography below 100 nm

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100074367 ◽

1983 ◽

Vol 41 ◽

pp. 96-99

Author(s):

L. D. Jackel

Keyword(s):

Spatial Distribution ◽

Electron Beam ◽

Electron Scattering ◽

Electron Beam Lithography ◽

Substrate Material ◽

Local Electron ◽

Electron Dose ◽

Positive Resist ◽

Exposure Process

Most production electron beam lithography systems can pattern minimum features a few tenths of a micron across. Linewidth in these systems is usually limited by the quality of the exposing beam and by electron scattering in the resist and substrate. By using a smaller spot along with exposure techniques that minimize scattering and its effects, laboratory e-beam lithography systems can now make features hundredths of a micron wide on standard substrate material. This talk will outline sane of these high- resolution e-beam lithography techniques.We first consider parameters of the exposure process that limit resolution in organic resists. For concreteness suppose that we have a “positive” resist in which exposing electrons break bonds in the resist molecules thus increasing the exposed resist's solubility in a developer. Ihe attainable resolution is obviously limited by the overall width of the exposing beam, but the spatial distribution of the beam intensity, the beam “profile” , also contributes to the resolution. Depending on the local electron dose, more or less resist bonds are broken resulting in slower or faster dissolution in the developer.

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The Reaction of Brain Structures with OsO4-Zinc-Iodide Stain

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100065419 ◽

1971 ◽

Vol 29 ◽

pp. 272-273

Author(s):

Werner J. Niklowitz

Keyword(s):

Electron Microscope ◽

Structural Changes ◽

Mossy Fiber ◽

Toxic Metal ◽

Staining Technique ◽

Brain Structures ◽

Oxidase Inhibitor ◽

Fiber Layer ◽

Hippocampal Tissue ◽

Zinc Iodide

After intoxication of rabbits with certain substances such as convulsant agents (3-acetylpyridine), centrally acting drugs (reserpine), or toxic metal compounds (tetraethyl lead) a significant observation by phase microscope is the loss of contrast of the hippocampal mossy fiber layer. It has been suggested that this alteration, as well as changes seen with the electron microscope in the hippocampal mossy fiber boutons, may be related to a loss of neurotransmitters. The purpose of these experiments was to apply the OsO4-zinc-iodide staining technique to the study of these structural changes since it has been suggested that OsO4-zinc-iodide stain reacts with neurotransmitters (acetylcholine, catecholamines).Domestic New Zealand rabbits (2.5 to 3 kg) were used. Hippocampal tissue was removed from normal and experimental animals treated with 3-acetylpyridine (antimetabolite of nicotinamide), reserpine (anti- hypertensive/tranquilizer), or iproniazid (antidepressant/monamine oxidase inhibitor). After fixation in glutaraldehyde hippocampal tissue was treated with OsO4-zinc-iodide stain and further processed for phase and electron microscope studies.

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SEM evaluation of the TEM cold-stage double-film specimen

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100111471 ◽

1984 ◽

Vol 42 ◽

pp. 272-273

Author(s):

Jayesh Bellare

Keyword(s):

Spatial Distribution ◽

Sample Preparation ◽

Sample Thickness ◽

Specimen Preparation ◽

Preparation Technique ◽

Liquid Sample ◽

Thin Specimen ◽

Sample Preparation Technique ◽

Cold Stage ◽

Film Specimen

Seeing is believing, but only after the sample preparation technique has received a systematic study and a full record is made of the treatment the sample gets.For microstructured liquids and suspensions, fast-freeze thermal fixation and cold-stage microscopy is perhaps the least artifact-laden technique. In the double-film specimen preparation technique, a layer of liquid sample is trapped between 100- and 400-mesh polymer (polyimide, PI) coated grids. Blotting against filter paper drains excess liquid and provides a thin specimen, which is fast-frozen by plunging into liquid nitrogen. This frozen sandwich (Fig. 1) is mounted in a cooling holder and viewed in TEM.Though extremely promising for visualization of liquid microstructures, this double-film technique suffers from a) ireproducibility and nonuniformity of sample thickness, b) low yield of imageable grid squares and c) nonuniform spatial distribution of particulates, which results in fewer being imaged.

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Macroprobe Mode for the Study of Segregation in Steels

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100134909 ◽

1990 ◽

Vol 48 (2) ◽

pp. 260-261

Author(s):

Auclair Gilles ◽

Benoit Danièle

Keyword(s):

Mechanical Properties ◽

Spatial Distribution ◽

High Performance ◽

Volume Fraction ◽

Sheet Steel ◽

Acquisition Time ◽

Chemical Information ◽

X Ray ◽

Accurate Quantitative Analysis ◽

Optical Micrographs

During these last 10 years, high performance correction procedures have been developed for classical EPMA, and it is nowadays possible to obtain accurate quantitative analysis even for soft X-ray radiations. It is also possible to perform EPMA by adapting this accurate quantitative procedures to unusual applications such as the measurement of the segregation on wide areas in as-cast and sheet steel products.The main objection for analysis of segregation in steel by means of a line-scan mode is that it requires a very heavy sampling plan to make sure that the most significant points are analyzed. Moreover only local chemical information is obtained whereas mechanical properties are also dependant on the volume fraction and the spatial distribution of highly segregated zones. For these reasons we have chosen to systematically acquire X-ray calibrated mappings which give pictures similar to optical micrographs. Although mapping requires lengthy acquisition time there is a corresponding increase in the information given by image anlysis.

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Ultrastructural analysis of the spatial distribution of MRNA

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100123167 ◽

1992 ◽

Vol 50 (1) ◽

pp. 552-553

Author(s):

Gary Bassell ◽

Robert H. Singer

Keyword(s):

Electron Microscopy ◽

Spatial Distribution ◽

In Situ Hybridization ◽

High Resolution ◽

Nucleic Acids ◽

Colloidal Gold ◽

Dna Probe ◽

Nucleotide Analogs ◽

Gold Particles

We have been investigating the spatial distribution of nucleic acids intracellularly using in situ hybridization. The use of non-isotopic nucleotide analogs incorporated into the DNA probe allows the detection of the probe at its site of hybridization within the cell. This approach therefore is compatible with the high resolution available by electron microscopy. Biotinated or digoxigenated probe can be detected by antibodies conjugated to colloidal gold. Because mRNA serves as a template for the probe fragments, the colloidal gold particles are detected as arrays which allow it to be unequivocally distinguished from background.

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