Yazarlar Ikiel Ptito onun devam eden teknik destek için teşekkür etmek istiyorum. MP NSERC hibe.

Bölüm 1: Ön-işleme doku <ol><li> Doku paraformaldehid, glutaraldehid, ya da formalin ile perfüze edilmelidir. Bu, genellikle diğer organlarda hasat için kullanılan standart transcardial perfüzyon yoluyla elde edilebilir. Bu çalışmada konu derinden sodyum pentobarbital (25 mg / kg, iv), aşırı dozda ötenazi ketamin hidroklorür (10 mg / kg, im), sedasyon ve tamamen exsanguinated.This takip olana kadar 0.1 M PBS ile transcardially perfüze 5 dakika (~ 1 litre) PBS içinde% 4 paraformaldehid çözüm. </li></ol> Bölüm 2: Stereotaksik engelleme <ol><li> Önce baş stereotaksik çerçeve içine yerleştirerek Horsley-Clarke/interaural uçak sıfır koordinatları alınması gerekir. Bu kulağı arasında teorik bir orta nokta. Bu düzlemde ölçmek için, kulak çubukları eşit aparat takılır gerekir, daha sonra stereotaksik manipülatör kolunun bir neşter bıçak ve kulak çubukları arasındaki orta ölçmek. Bu araştırma ihtiyaçlarını dayalı doku blok nerede belirlemek için önemlidir. Bu aşama tamamlandıktan sonra kafatası stereotaksik cihazın içine sabitleme için hazırlıklı olmak gerekiyor. </li><li> Baş stereotaksik çerçeve içine yerleştirmek için alt çene kemik rongeurs ve bir neşter ile temizlenebilir olması. Ayrıca cilt, kas, bağ doku ve kemik, kafatası açığa amacıyla çıkarılmalıdır. Bağ dokusu, kafatası kaldırıldıktan sonra, calvaria (oksipital kemik tablo kısmı parietal yanı sıra, reklam frontal kemiklerin) yontulmasıyla beynin maruz bırakmayın. Calvaria mevcut deney parçası olarak tüm hazır kaldırıldı. Temporal kemikler kulak kanalları stereotaksik çerçeve içine başını yere sağlam olması gerekir, çünkü tamamen kaldırmak için değil, dikkatli olun. Maruz kalan bir beyin kalan dura madde çıkarılmalıdır. Kafatası stereotaksik çerçeve içine yerleştirilmek üzere hazırdır. </li><li> Aynı şekilde tek bir stereotaksik ameliyat olacağı, göz, damak ve kulak çubukları ağzı stereotaksik aparat sabit olduğunu ayarlayabilirsiniz. Stereotaksik manipülatör yerleştirin ve önceden belirlenmiş (A / P) anterior / posterior koordinatlarda manipülatör beynin lateral hareket. Yavaşça, beyin içine bıçak alt beyinden gelen bıçak tamamen yükseltmek, daha sonra mediale hareket ettirin ve tekrar bıçak düşük. Bıçak ters yarımkürede lateral ulaşıncaya kadar bu iki adımı tekrarlayın. Bu ilk koronal blok tamamlar. Tüm beyni bloke dek sonraki koronal blok A / P ekseni ve tekrar manipülatör 1cm hareket. </li></ol> Bölüm 3: kafatası beyin çıkarma <ol><li> Stereotaksik çerçeve başını çıkarın ve elinizin avuç maruz kalan beyin tutun. Coddling beyin elinizin avuç içinde hafifçe yerleştirerek ve frontal loblar, kafatasının, beynin bu en aza indirir hareketi arasında serçe parmak beyin güvenli çalışın. Pial beyin yüzeyinin kurumasını önlemek için, bir parça PBS beyin boyunca nemlendirilmiş gazlı bez yerleştirin. Omuriliğe birlikte kafatası ve yonga uzak kalan oksipital ve temporal kemikler tarafından iyice kafa tutun. Bu beyin taban ve yanal yönlerini ortaya koyar. Son olarak koku ampuller erişim sağlayacaktır kalan frontal kemik ve burun kemiği, kaldırmak. Kafatası tabanı kaldırmak gibi beyin biraz hareket eder ve frontal loblar fontal kemik pürüzlü kenarlar zarar görmüş olabilir, çünkü son frontal kemikte kaldırmak için önemlidir. Kesme ve kalan dura madde kaldırmak. Dikkatle, beynin ön kaldırın kafatası, beyin ve beynin altında neşter kaydırın. </li></ol> Bölüm 4: Ölçüler <ol><li> Donmaya karşı önce yapılabilir yararlıdır ölçümlerin bir dizi vardır. Örneğin, bir cetvel ile beyin A / P ekseni. Ayrıca belirli bir yoğunluk mezun silindir hacmi deplasman (Tablo 1) ağırlık bölünmesi yerinden su hacmini ölçerek, beyin ağırlığında ölçülebilir. </li></ol> Bölüm 5: Son beyin engelleme. <ol><li> Genelde beyin neşter bıçak takıldığında bunu tamamen beyin tam dorsal-ventral ölçüde nüfuz etmek için yeterince uzun değildir. Beyin kaldırılır ve brüt ölçümler elde edildikten sonra, bir doku dilimleme bıçağı alır ve beynin ventral tarafında (Şekil 2) yoluyla beyni bloke bitirmek. </li><li> Blokları dondurma önce, bakımı, 4 ˚ C kadar beyin lavabolar (10, 20, ve% 30) doku cryoprotect kademeli PBS-tamponlu sakaroz çözümler gereklidir. Genellikle 2-3 gün ve% 20 ek 3-5 gün kabın dibine batırmak için bloklar için% 30,% 10 bir gece inkübasyon alır. Inci bir günlük değişime% 30 sakaroz çözeltisini tavsiye edilir. </li></ol> Bölüm 6: Temsilci Sonuçlar Beyin kafatası kaldırıldıktan sonra yapılabilir brüt morfolojik ölçümleri vardır. Bunlar A / P uzunluk, ağırlık, ve özgül yoğunluğu (Tablo 1). Biz genellikle 1cm (Şekil 1) ölçüm 6-7 bloklar halinde beyin blok. Her bir parça sonra fotoğraflandı (Şekil 2) ve daha fazla araştırma ihtiyaçlarına bağlı olarak disseke veya kademeli sakaroz çözümler dondurmak için hazırlanmış olabilir. <table border="1"><tbody><tr><td> Konu </td><td> A / P Uzunluk (Mm) </td><td> Ağırlık (Gram) </td><td> Su Hacmi (Ml) </td><td> Özgül Yoğunluk (G / ml) </td></tr><tr><td> O2303-2-1-1 </td><td> 64,3 </td><td> 28,1 </td><td> 24 </td><td> 1,171 </td></tr><tr><td> O5180-1 </td><td> 71,3 </td><td> 38,7 </td><td> 34 </td><td> 1,138 </td></tr><tr><td> O2708-3-1 </td><td> 62,8 </td><td> 28,7 </td><td> 26 </td><td> 1,104 </td></tr><tr><td> O9184-4-2 </td><td> 65,3 </td><td> 29,5 </td><td> 24 </td><td> 1,229 </td></tr><tr><td> N459-1-14-2 </td><td> 68,2 </td><td> 31,6 </td><td> 26 </td><td> 1,215 </td></tr><tr><td> ORTALAMA </td><td> 66,38 </td><td> 31,32 </td><td> 26,8 </td><td> 1,171 </td></tr><tr><td> STD DEV </td><td> 3,38 </td><td> 4,33 </td><td> 4,17 </td><td> 0,052 </td></tr></tbody></table> 5 Ay Eski Vervets sağ yarımkürede Tablo 1 Brüt Morfolojik Ölçümleri <img src="/files/ftp_upload/1259/1259fig1.jpg" alt="Şekil 1" /> <img src="/files/ftp_upload/1259/1259fig2.jpg" alt="Şekil 1.5" /> Şekil 1. Beyin engellemek için kullanılan koronal planlarda Şemalar Bu bir dışsallaşmış yetişkin vervet beyin bir örnektir. Engelleme işlemi örneği. Burada dikey çizgiler genellikle her yarımkürede 7 koronal blok üreten, 1 cm aralıklı. <img src="/files/ftp_upload/1259/1259fig3.jpg" alt="Şekil 2" /> Şekil 2. Stereotaksik alan beyin doku bloklar Her blok 50μm alınan yaklaşık 200 bölüm verim. Bu örnekleme şeması ile koronal planda dilimlenmiş korteks üzerinden 1200&#39;den fazla bölümleri beyincik ve ek bir 400-500 olacak.

<ol>
	<li>Gallagher, M., Rapp, P. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+use+of+animal+models+to+study+the+effects+of+aging+on+cognition.+Annu+Rev+Psychol+48.">The use of animal models to study the effects of aging on cognition. Annu Rev Psychol 48.</a> , 339-370 (1997).</li><li>Clancy, B., Darlington, R., Finlay, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Translating+developmental+time+across+mammalian+species.">Translating developmental time across mammalian species.</a> Neuroscience. 105, 7-17 (2001).</li><li>Nowakowski, R. S., Rakic, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+site+of+origin+and+route+and+rate+of+migration+of+neurons+to+the+hippocampal+region+of+the+rhesus+monkey.">The site of origin and route and rate of migration of neurons to the hippocampal region of the rhesus monkey.</a> J Comp Neurol. 196, 129-154 (1981).</li><li>Rakic, P., Bourgeois, J. P., Eckenhoff, M. F., Zecevic, N., Goldman-Rakic, P. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Concurrent+overproduction+of+synapses+in+diverse+regions+of+the+primate+cerebral+cortex.">Concurrent overproduction of synapses in diverse regions of the primate cerebral cortex.</a> Science. 232, 232-235 (1986).</li><li>Granger, B., Tekaia, F., Le Sourd, A. M., Rakic, P., Bourgeois, J. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tempo+of+neurogenesis+and+synaptogenesis+in+the+primate+cingulate+mesocortex:+comparison+with+the+neocortex.">Tempo of neurogenesis and synaptogenesis in the primate cingulate mesocortex: comparison with the neocortex.</a> J Comp Neurol. 360, 363-376 (1995).</li><li>Zecevic, N., Rakic, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+layer+I+neurons+in+the+primate+cerebral+cortex.">Development of layer I neurons in the primate cerebral cortex.</a> J Neurosci. 21, 5607-5619 (2001).</li><li>Ervin, F. R., Palmour, R. M., Young, S. N., Guzman-Flores, C., Juarez, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Voluntary+consumption+of+beverage+alcohol+by+vervet+monkeys:+population+screening,+descriptive+behavior+and+biochemical+measures.">Voluntary consumption of beverage alcohol by vervet monkeys: population screening, descriptive behavior and biochemical measures.</a> Pharmacol Biochem Behav. 36, 367-373 (1990).</li><li>Palmour, R. M., Mulligan, J., Howbert, J. 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R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+neural+stem+cells+migrate+along+the+nigrostriatal+pathway+in+a+primate+model+of+Parkinson's+disease.">Human neural stem cells migrate along the nigrostriatal pathway in a primate model of Parkinson's disease.</a> Exp Neurol. 211, 362-369 (2008).</li><li>Lemere, C. A., Beierschmitt, A., Iglesias, M., Spooner, E. T., Bloom, J. K., Leverone, J. F., Zheng, J. B., Seabrook, T. J., Louard, D., Li, D., Selkoe, D. J., Palmour, R. M., Ervin, F. 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The authors have nothing to disclose.

St Kitts vervet (Chlorocebus aethiops sabeus) insanların kortikal ve subkortikal beyin gelişiminde benzer alışkanlıkları ve oranları ile bir Eski Dünya primat. Bu tür gibi karmaşık insan davranış bozuklukları endişeli davranış, hipertansiyon 8, hemisferektomi 9, Parkinson hastalığı 10, Alzhemier hastalığında 11 ve alkol kötüye kullanımı 12 modeli için kullanılır olmuştur. Daha yakın zamanlarda, bu tür natüralist prenatal etanol maruz kalma nöroanatomik etkilerini incelemek için kullanılır olmuştur. Hamile vervets üçüncü trimesterde, 3-5 standart içki haftada dört kez eşdeğer içmek için izin ve frontal korteks 13 nöronların% 35&#39;lik bir azalma olduğu rapor edildi . Bu çalışma için beyinleri stereotaxically sadece 3 7 blok kesitli frontal korteks stereolojik değerlendirme tamamlamak için gereken bloke edildi. Bu tekniğin insan dışı primat beyin sınırlı değildir, ama yanı sıra kemirgen beyin uzatılabilir. Örneğin, bir sıçan somatosensoriyel korteks ilgi bölge ise o bölgenin ön ve arka stereotaksik kesme kemirgen stereotaksik çerçeve kullanarak olabilir. Bu bölümde küçük bir bölge ve hayvanlar arasında bir standart koronal düzlemde sağlar. Medial-lateral herhangi bir hareketi, aksi takdirde bıçak un mutlaka beyin hasarı stereotaksik manipülatör yapılmadan önce bıçak beyin tamamen retrakte gerektiğini not etmek önemlidir.

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<td>Scalpel</td>
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dissecting the non-human primate brain in stereotaxic space

Insan olmayan primatlardan, insanlarda gelişim ve yaşlanma süreçleri anlamak için mükemmel bir translasyonel modeli sağlar<sup&gt; 1-6</sup&gt;. Buna ek olarak, insan olmayan primatlardan kullanımı son zamanlarda, alkol bağımlılığı gibi karmaşık psikiyatrik bozukluklar doğal olarak modellemek için fırsat sağladığı vardır<sup&gt; 7</sup&gt;. Burada koronal düzlemde vervet maymun beyni bloke etmek için bir tekniktir (<em&gt; Chlorocebus aethiops sabeus</em&gt;) Stereotaksik alanı bozulmamış bir kafatası. Bu yöntem, burada blok ve bloklar arasındaki konular ve en aza indirir kısmi bölümleri arasındaki bölümde standart bir düzlemde sağlar nitelendirdi. Koronal düzlemde bir doku blok Kesit de bir ilgi alanı tarif kolaylaştırır. Bu yöntem, 50μm az dilimleme vervet maymun tek bir yarımkürede 1200&#39;den fazla bölüm verir yönetilebilir büyüklükte bloklar sağlar. Ayrıca beyin 1cm bloklar halinde bloke ederek, cyroprotection için sakaroz penetrasyonu kolaylaştırır ve blok standart bir Kriyostat dilimlenmiş olanak sağlar.

Watch this Scientific Journal Video about Dissecting the Non-human Primate Brain in Stereotaxic Space at JoVE.com

Dissecting the Non-human Primate Brain in Stereotaxic Space

Insan dışı primat beynin normal işleme anlamak için önemli bir translasyonel türüdür. Primat beynin anatomik organizasyonu, insanlarda normal ve patolojik durumları önemli bilgiler sağlayabilir.

Sigara insan Stereotaksik Uzay Primate Beyin Diseksiyon

The use of non-human primates provides an excellent translational model for our understanding of developmental and aging processes in humans1-6. In ...

dissecting-the-non-human-primate-brain-in-stereotaxic-space

Universidad San Sebastian

Research

JoVE Journal

Biology

10.0K Görüntüleme.  University of Montreal. Insan dışı primat beynin normal işleme anlamak için önemli bir translasyonel türüdür. Primat beynin anatomik organizasyonu, insanlarda normal ve patolojik durumları önemli bilgiler sağlayabilir.

Video: Dissecting the Non-human Primate Brain in Stereotaxic Space

Single Cell Electroporation in vivo within the Intact Developing Brain

Single-cell electroporation (SCE) is a specialized technique allowing the delivery of DNA or other macromolecules into individual cells within intact tissue, including in vivo preparations. The distinct advantage of this technique is that experimental manipulations may be performed on individual cells while leaving the surrounding tissue unaltered, thereby distinguishing cell-autonomous effects from those resulting from global treatments. When combined with advanced in vivo imaging techniques, SCE of fluorescent markers permits direct visualization of cellular morphology, cell growth, and intracellular events over timescales ranging from seconds to days. While this technique is used in a variety of in vivo and ex vivo preparations, we have optimized this technique for use in Xenopus laevis tadpoles. In this video article, we detail the procedure for SCE of a fluorescent dye or plasmid DNA into neurons within the intact brain of the albino Xenopus tadpole. We also discuss methods to optimize yield, and show examples of live two-photon fluorescence imaging of neurons fluorescently labeled by SCE.

Single-cell electroporation (SCE) is a specialized technique allowing delivery of DNA or other macromolecules into individual cells within intact tissue, including in vivo preparations. Here we detail the procedure for SCE of a fluorescent dye or plasmid DNA into neurons within the intact brain of the Xenopus laevis tadpole.

Tek Hücre Elektroporasyon bozulmamış Gelişmekte olan beyin içindeki in vivo

Single-cell electroporation (SCE) is a specialized technique allowing the delivery of DNA or other macromolecules into individual cells within intact ...

Biyoloji

Survivable Stereotaxic Surgery in Rodents 

The ability to measure extracellular basal levels of neurotransmitters in the brain of awake animals allows for the determination of effects of different systemic challenges (pharmacological or physiological) to the CNS. For example, one can directly measure how the animal's midbrain dopamine projections respond to dopamine-releasing drugs like d-amphetamine or natural stimuli like food. In this video, we show you how to implant guide cannulas targeting specific sites in the rat brain, how to insert and implant a microdialysis probe and how to use high performance liquid chromatography coupled with electrochemical detection (HPLC-EC) to measure extracellular levels of oxidizable neurotransmitters and metabolites. Local precise introduction of drugs through the microdialysis probe allows for refined work on site specificity in a compound s mechanism of action. This technique has excellent anatomical and chemical resolution but only modest time resolution as microdialysis samples are usually processed every 20-30 minutes to ensure detectable neurotransmitter levels. Complementary ex vivo tools (i.e., slice and cell culture electrophysiology) can assist with monitoring real-time neurotransmission.

Survivable Stereotaxic Surgery in Rodents

The monitoring of extracellular neurotransmitter levels in distinct brain regions of freely moving animals offers insights on the link between neurotransmitter release and behavior. In vivo microdialysis coupled with electrochemical detection provides excellent anatomical and chemical resolution; and information on how basal neurotransmission is altered by pharmacological or physiological manipulations.

Kemirgenler içinde Kurtarılabilir Stereotaksik Cerrahi

The ability to measure extracellular basal levels of neurotransmitters in the brain of awake animals allows for the determination of effects of different ...

Dissecting and Recording from The C. Elegans Neuromuscular Junction

Neurotransmission is the process by which neurons transfer information via chemical signals to their post-synaptic targets, on a rapid time scale. This complex process requires the coordinated activity of many pre- and post-synaptic proteins to ensure appropriate synaptic connectivity, conduction of electrical signals, targeting and priming of secretory vesicles, calcium sensing, vesicle fusion, localization and function of postsynaptic receptors and finally, recycling mechanisms. As neuroscientists it is our goal to elucidate which proteins function in each of these steps and understand their mechanisms of action. Electrophysiological recordings from synapses provide a quantifiable read out of the underlying electrical events that occur during synaptic transmission. By combining this technique with the powerful array of molecular and genetic tools available to manipulate synaptic proteins in C. elegans, we can analyze the resulting functional changes in synaptic transmission. 
The C. elegans NMJs formed between motor neurons and body wall muscles control locomotion, therefore, mutants with uncoordinated locomotory phenotypes (known as unc s) often perturb synaptic transmission at these synapses 1. Since unc mutants are maintained on a rich supply of a bacterial food source, they remain viable as long as they retain some pharyngeal pumping ability to ingest food. This, together with the fact that C. elegans exist as hermaphrodites, allows them to pass on mutant progeny without the need for elaborate mating behaviors. These attributes, coupled with our recent ability to record from the worms NMJs 2,3,7 make this an excellent model organism in which to address precisely how unc mutants impact neurotransmission. 
The dissection method involves immobilizing adult worms using a cyanoacrylic glue in order to make an incision in the worm cuticle exposing the NMJs. Since C. elegans adults are only 1 mm in length the dissection is performed with the use of a dissecting microscope and requires excellent hand-eye coordination. NMJ recordings are made by whole-cell voltage clamping individual body wall muscle cells and neurotransmitter release can be evoked using a variety of stimulation protocols including electrical stimulation, light-activated channel-rhodopsin-mediated depolarization 4 and hyperosmotic saline, all of which will be briefly described.

Application of electrophysiology to accessible synapses provides a quantifiable measure of synaptic activity, useful in analyzing synaptic mutants. This article describes a dissection method used to expose the neuromuscular junctions (NMJ) of Caenorhabditis elegans (C. elegans) and briefly discusses some of the uses to which this preparation can be applied.

C. Elegans Nöromüsküler Kavşağı Diseksiyon ve kayıt

Neurotransmission is the process by which neurons transfer information via chemical signals to their post-synaptic targets, on a rapid time scale.   This ...

The Gateway to the Brain: Dissecting the Primate Eye

The visual system in humans is considered the gateway to the world and plays a principal role in the plethora of sensory, perceptual and cognitive processes. It is therefore not surprising that quality of vision is tied to quality of life . Despite widespread clinical and basic research surrounding the causes of visual disorders, many forms of visual impairments, such as retinitis pigmentosa and macular degeneration, lack effective treatments. Non-human primates have the closest general features of eye development to that of humans. Not only do they have a similar vascular anatomy, but amongst other mammals, primates have the unique characteristic of having a region in the temporal retina specialized for high visual acuity, the fovea1. Here we describe a general technique for dissecting the primate retina to provide tissue for retinal histology, immunohistochemistry, laser capture microdissection, as well as light and electron microscopy. With the extended use of the non-human primate as a translational model, our hope is that improved understanding of the retina will provide insights into effective approaches towards attenuating or reversing the negative impact of visual disorders on the quality of life of affected individuals.

The non-human primate is an important translational species for our understanding of development and aging. The anatomical organization of the primate retina may provide important insights into normal and pathological conditions in humans.

Beyin Ağ Geçidi: Primate Göz Diseksiyon

The visual system in humans is considered the  gateway  to the world and plays a principal role in the plethora of sensory, perceptual and cognitive ...

Knowing What Counts: Unbiased Stereology in the Non-human Primate Brain

The non-human primate is an important translational species for understanding the normal function and disease processes of the human brain. Unbiased stereology, the method accepted as state-of-the-art for quantification of biological objects in tissue sections2, generates reliable structural data for biological features in the mammalian brain3. The key components of the approach are unbiased (systematic-random) sampling of anatomically defined structures (reference spaces), combined with quantification of cell numbers and size, fiber and capillary lengths, surface areas, regional volumes and spatial distributions of biological objects within the reference space4. Among the advantages of these stereological approaches over previous methods is the avoidance of all known sources of systematic (non-random) error arising from faulty assumptions and non-verifiable models. This study documents a biological application of computerized stereology to estimate the total neuronal population in the frontal cortex of the vervet monkey brain (Chlorocebus aethiops sabeus), with assistance from two commercially available stereology programs, BioQuant Life Sciences and Stereologer (Figure 1). In addition to contrast and comparison of results from both the BioQuant and Stereologer systems, this study provides a detailed protocol for the Stereologer system.

The anatomical organization of the primate brain can provide important insights into normal and pathological conditions in humans. Unbiased stereology is a method for accurately and efficiently estimating the total neuron number (or other cell type) in a given reference space1.

Sigara insan Primate Beyin | Stereology: sayar ne bilmek

The non-human primate is an important translational species for understanding the normal function and disease processes of the human brain. Unbiased ...

Trajectory Data Analyses for Pedestrian Space-time Activity Study

It is well recognized that human movement in the spatial and temporal dimensions has direct influence on disease transmission1-3. An infectious disease typically spreads via contact between infected and susceptible individuals in their overlapped activity spaces. Therefore, daily mobility-activity information can be used as an indicator to measure exposures to risk factors of infection. However, a major difficulty and thus the reason for paucity of studies of infectious disease transmission at the micro scale arise from the lack of detailed individual mobility data. Previously in transportation and tourism research detailed space-time activity data often relied on the time-space diary technique, which requires subjects to actively record their activities in time and space. This is highly demanding for the participants and collaboration from the participants greatly affects the quality of data4.
Modern technologies such as GPS and mobile communications have made possible the automatic collection of trajectory data. The data collected, however, is not ideal for modeling human space-time activities, limited by the accuracies of existing devices. There is also no readily available tool for efficient processing of the data for human behavior study. We present here a suite of methods and an integrated ArcGIS desktop-based visual interface for the pre-processing and spatiotemporal analyses of trajectory data. We provide examples of how such processing may be used to model human space-time activities, especially with error-rich pedestrian trajectory data, that could be useful in public health studies such as infectious disease transmission modeling.
The procedure presented includes pre-processing, trajectory segmentation, activity space characterization, density estimation and visualization, and a few other exploratory analysis methods. Pre-processing is the cleaning of noisy raw trajectory data. We introduce an interactive visual pre-processing interface as well as an automatic module. Trajectory segmentation5 involves the identification of indoor and outdoor parts from pre-processed space-time tracks. Again, both interactive visual segmentation and automatic segmentation are supported. Segmented space-time tracks are then analyzed to derive characteristics of one's activity space such as activity radius etc. Density estimation and visualization are used to examine large amount of trajectory data to model hot spots and interactions. We demonstrate both density surface mapping6 and density volume rendering7. We also include a couple of other exploratory data analyses (EDA) and visualizations tools, such as Google Earth animation support and connection analysis. The suite of analytical as well as visual methods presented in this paper may be applied to any trajectory data for space-time activity studies.

A suite of spatiotemporal processing methods are presented to analyze human trajectory data, such as that collected using a GPS device, for the purpose of modeling pedestrian space-time activities.

Yaya Uzay-zaman Aktivite Çalışmaları Yörünge Veri Analizleri

It is well recognized that human movement in the  spatial and temporal dimensions has direct influence on disease transmission1-3.  An infectious disease ...

Physiology Lab Demonstration: Glomerular Filtration Rate in a Rat

Measurements of glomerular filtration rate (GFR), and the fractional excretion of sodium (Na) and potassium (K) are critical in assessing renal function in health and disease. GFR is measured as the steady state renal clearance of inulin which is filtered at the glomerulus, but not secreted or reabsorbed along the nephron. The fractional excretion of Na and K can be determined from the concentration of Na and K in plasma and urine. The renal clearance of inulin can be demonstrated in an anesthetized animal which has catheters in the femoral artery, femoral vein and bladder. The equipment and supplies used for this procedure are those commonly available in a research core facility, and thus makes this procedure a practical means for measuring renal function. The purpose of this video is to demonstrate the procedures required to perform a lab demonstration in which renal function is assessed before and after a diuretic drug. The presented technique can be utilized to assess renal function in rat models of renal disease.

The purpose of this protocol is to demonstrate the principles and techniques for measuring and calculating glomerular filtration rate, urine flow rate, and excretion of sodium and potassium in a rat. This demonstration can be used to provide students with an overall conceptual understanding of how to measure renal function.

Fizyoloji Laboratuvarı Gösteri: Bir Sıçan Glomerüler Filtrasyon Hızı

Measurements of glomerular filtration rate (GFR), and the fractional excretion of sodium (Na) and potassium (K) are critical in assessing renal function ...

Sampling Blood from the Lateral Tail Vein of the Rat

Blood samples are commonly obtained in many experimental contexts to measure targets of interest, including hormones, immune factors, growth factors, proteins, and glucose, yet the composition of the blood is dynamically regulated and easily perturbed. One factor that can change the blood composition is the stress response triggered by the sampling procedure, which can contribute to variability in the measures of interest. Here we describe a procedure for blood sampling from the lateral tail vein in the rat. This procedure offers significant advantages over other more commonly used techniques. It permits rapid sampling with minimal pain or invasiveness, without anesthesia or analgesia. Additionally, it can be used to obtain large volume samples (upwards of 1 ml in some rats), and it may be used repeatedly across experimental days. By minimizing the stress response and pain resulting from blood sampling, measures can more accurately reflect the true basal state of the animal, with minimal influence from the sampling procedure itself.

Blood samples are useful for assessing biomarkers of physiological states or disease in vivo. Here we describe the methodology to sample blood from the lateral tail vein in the rat. This method provides rapid samples with minimal pain and invasiveness.

Rat Yanal Kuyruk Ven gelen Kan Örnekleme

Blood samples are commonly obtained in many experimental contexts to measure targets of interest, including hormones, immune factors, growth factors, ...

Micropuncture of Bowman's Space in Mice Facilitated by 2 Photon Microscopy

Renal micropuncture and renal 2-photon imaging are seminal techniques in renal physiology. However, micropuncture is limited by dependence on conventional microscopy to surface nephron features, and 2-photon studies are limited in that interventions can only be assessed at the organ, rather than the nephron level. In particular, micropuncture studies of the glomeruli of mice have been challenged by the paucity of surface glomeruli in mice. To address this limitation in order to pursue studies of aspirate from Bowman&#39;s space in mouse physiologic models, we developed 2-photon glomerular micropuncture. We present a novel surgical preparation that allows lateral access to the kidney while preserving the required vertical imaging column for 2-photon microscopy. Administration of high molecular weight fluorescein isothiocyanate (FITC)-dextran is used to render the renal vasculature and therefore glomeruli visible for 2-photon imaging. A quantum dot-coated pipette is then introduced under stereotactic guidance to a glomerulus selected from the several to many which may be visualized within the imaging window. In this protocol, we provide details of the preparation, materials, and methods necessary to carry out the procedure. This technique facilitates previously-impossible physiologic study of the kidney, including recovery of filtrate from Bowman&#39;s space and all segments of the nephron within the imaging depth limit, about 100 &#181;m below the renal capsule. Pressure, charge and flow may all be measured using the introduced pipette. Here, we provide representative data from liquid chromatography/mass spectrometry performed on aspirate from Bowman&#39;s space. We expect this technique to have wide applicability in renal physiologic investigation.

We present use of 2-photon microscopy to place a micropipette within Bowman&#39;s urinary space in mice, combining 2 foundational techniques of renal physiology. Use of 2-photon microscopy overcomes critical limitations of conventional microscopy for micropuncture renal physiology studies.

Micropuncture tarafından 2 foton mikroskobu kolaylaştırdı farelerde Bowman'ın alanı

Renal micropuncture and renal 2-photon imaging are seminal techniques in renal physiology. However, micropuncture is limited by dependence on conventional ...

Reverse Dissection and DiceCT Reveal Otherwise Hidden Data in the Evolution of the Primate Face

Facial expressions, or facial displays, of social or emotional intent are produced by many mammalian taxa as a means of visually communicating with conspecifics at a close range. These displays are achieved by contraction of the mimetic muscles, which are skeletal muscle attached to the dermis of the face. Reverse dissection, removing the full facial mask from the skull and approaching mimetic muscles in reverse, is an effective but destructive way of revealing the morphology of mimetic muscles but it is destructive. DiceCT is a novel mechanism for visualizing skeletal muscles, including mimetic muscles, and isolating individual muscle fascicles for quantitative measurement. Additionally, DiceCT provides a non-destructive mechanism for visualizing muscles. The combined techniques of reverse dissection and DiceCT can be used to assess the evolutionary morphology of mimetic musculature as well as potential contraction strength and velocity in these muscles. This study further demonstrates that DiceCT can be used to accurately and reliably visualize mimetic muscles as well as reverse dissection and provide a non-destructive method for sampling mimetic muscles.

Facial expressions are a mode of visual communication produced by mimetic muscles. Here, we present protocols for the novel techniques of reverse dissection and DiceCT to fully visualize and assess mimetic muscles. These combined techniques can examine both morphological and physiological aspects of mimetic musculature to determine functional aspects.

Diseksiyon ve DiceCT gizli ortaya başka veri evrim primat yüz ve ters

Facial expressions, or facial displays, of social or emotional intent are produced by many mammalian taxa as a means of visually communicating with ...