تمويل المنح الدراسية التي تقدمها Ribble زاي في قسم علم الأحياء ، والباحثون كنتاكي الشباب والمرحلة الجامعية ، وجدتها! مكتب (جامعة من كنتاكي).

<ol>
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<ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> أدوات تشريح : الجميلة # 5 ملاقط ومقصات غرامة (الحصول على جميع العلوم من أدوات الجميلة (الولايات المتحدة) ، وشركة ، 373 - G فخمة بارك محرك ، فوستر سيتي ، كاليفورنيا 94404-1139) </li><li style=";text-align:right;direction:rtl"> تشريح المجهر مع وظيفة التكبير والتصغير للتشريح والفرز معدل ضربات القلب. لتحفيز التنسيق للقلب هناك حاجة لذلك أيضا. </li><li style=";text-align:right;direction:rtl"> للتسجيلات خارج الخلية داخل الخلايا ويستخدم مجهر مركب تستقيم مع أهداف (4 x و 20X). مضخم الخلايا القياسية وA / D لوحة تسجيل على الخط لجهاز كمبيوتر. يتم تسجيل الإشارات الكهربائية على الخط إلى واجهة PowerLab/4s (ADInstruments واستراليا). نستخدم البرامج القياسية من ADInstruments اسمه تخطيط أو نطاق. </li><li style=";text-align:right;direction:rtl"> الكيماويات : يتم الحصول على جميع المواد الكيميائية المالحة من شركة سيغما الكيميائية (سانت لويس ، MO). </li><li style=";text-align:right;direction:rtl"> للتسجيلات الخلايا نستخدم أنابيب الزجاج الشعرية (كتالوج # 30-31-0 من FHC ، برونزويك ، ME ، 04011 ، الولايات المتحدة) لتسجيل وmacropatch الاتصال وتحفيز كهربائي نستخدم Kimax - 51 ، كيمبل منتجات الفن. رقم 34502 ، رقم 0.8 1.1mm ، طول 100mm. ينبغي أن يكون القطب الخلايا المقاومة بين 20 و 30 mOhm. هي التي شيدت من قبل القطب macropatch قطع غيض من الزجاج بعد أن قدم معلومات سرية غرامة من مجتذب الكهربائي. غيض قبالة كسر يحتاج إلى فترة انقطاع عن 20μM عمودي نظيفة في القطر. غيض من الحرارة ثم مصقول ل10μM عن القطر الداخلي للتسجيل خارج الخلية التنسيق. للتحفيز الكهربائي للقلب محرك نستخدم طرف النهائي من حوالي 20-50 ميكرومتر في القطر. يتم تشغيل رمح القطب على عنصر التدفئة لتجعله ينحني نحو 45 درجة مئوية مع منحنى تدريجيا. هذا ينتج شقة أو التجويف الكهربائي عمودي على أنبوب القلب وزاوية مع تتلاعب الصغيرة سوف تنتج نحو 45 درجة أخرى إلى الإعداد. </li></ol>

monitoring heart function in larval drosophila melanogaster for physiological studies

نقدم أساليب مختلفة لتسجيل وظيفة القلب في اليرقات<em&gt; ذبابة الفاكهة</em&gt;. النهج يسمح بقياس معدل ضربات القلب في كل اليرقات غير المقيد وضبط النفس. للسيطرة المباشرة للبيئة حول القلب نهج آخر يستخدم يرقات تشريح وإزالة الأجهزة الداخلية من أجل الاستحمام القلب في المركبات المطلوبة. قلب يتعرض يسمح أيضا لرصد الامكانيات الغشاء الذي يمكن أن تعطي فكرة للتيارات الأيونية التي تم إنشاؤها بواسطة myocytes والتوصيل الكهربائي على طول أنبوب القلب. هذه المقاربات المختلفة لديها مزايا وعيوب للتجارب التي تمت مناقشتها في المستقبل. إعداد القلب اليرقات نموذجا إضافية إلى جانب<em&gt; ذبابة الفاكهة</em&gt; NMJ الهيكل العظمي للتحقيق في دور تنظيم الكالسيوم داخل الخلايا على وظيفة الخلوية. تعلم المزيد حول التيارات الأساسية التي تشكل الأيونية إمكانات العمل في myocytes في مختلف الأنواع ، ويمكن للمرء أن يأمل في الحصول على التعامل مع الاختلالات في الأيونية المعروفة المرتبطة جينات محددة مسؤولة عن الأمراض المختلفة في الثدييات.

Watch this Scientific Journal Video about Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies at JoVE.com

Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies

نقدم وسائل مختلفة لمراقبة وظيفة القلب في يرقة<em&gt; ذبابة الفاكهة</em&gt; لتقييم الأسئلة التعامل مع وظيفة تقاطعات الفجوة ، والطفرات القناة الايونية ، تعديل تنظيم ضربات القلب والنشاط الدراسات الدوائية.

رصد وظيفة القلب في اليرقات ذبابة الفاكهة السوداء البطن للدراسات فسيولوجية

We present various methods to record cardiac function in the larval Drosophila. The approaches allow heart rate to be measured in unrestrained  and  ...

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Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies

18.8K Views.  University of Kentucky, Lexington. نقدم وسائل مختلفة لمراقبة وظيفة القلب في يرقة ذبابة الفاكهة لتقييم الأسئلة التعامل مع وظيفة تقاطعات الفجوة ، والطفرات القناة الايونية ، تعديل تنظيم ضربات القلب والنشاط الدراسات الدوائية.

Video: Monitoring Heart Function in Larval Drosophila melanogaster for Physiological Studies

Dissection of Larval CNS in Drosophila Melanogaster

The central nervous system (CNS) of Drosophila larvae is complex and poorly understood.  One way to investigate the CNS is to use immunohistochemistry to examine the expression of various novel and marker proteins.  Staining of whole larvae is impractical because the tough cuticle prevents antibodies from penetrating inside the body cavity.  In order to stain these tissues it is necessary to dissect the animal prior to fixing and staining.  In this article we demonstrate how to dissect Drosophila larvae without damaging the CNS.  Begin by tearing the larva in half with a pair of fine forceps, and then turn the cuticle "inside-out" to expose the CNS.  If the dissection is performed carefully the CNS will remain attached to the cuticle.  We usually keep the CNS attached to the cuticle throughout the fixation and staining steps, and only completely remove the CNS from the cuticle just prior to mounting the samples on glass slides.  We also show some representative images of a larval CNS stained with Eve, a transcription factor expressed in a subset of neurons in the CNS.  The article concludes with a discussion of some of the practical uses of this technique and the potential difficulties that may arise.

In this article we demonstrate how to dissect the central nervous system from third instar Drosophila larvae.

تشريح الجهاز العصبي المركزي اليرقات في Melanogaster ذبابة الفاكهة

The central nervous system (CNS) of Drosophila larvae is complex and poorly understood.  One way to investigate the CNS is to use immunohistochemistry to ...

High-Resolution Video Tracking of Locomotion in Adult Drosophila Melanogaster

Flies provide an important model for studying complex behavior due to the plethora of genetic tools available to researchers in this field. Studying locomotor behavior in Drosophila melanogaster relies on the ability to be able to quantify changes in motion during or in response to a given task. For this reason, a high-resolution video tracking system, such as the one we describe in this paper, is a valuable tool for measuring locomotion in real-time. Our protocol involves the use of an initial air pulse to break the flies momentum, followed by a thirty second filming period in a square chamber. A tracking program is then used to calculate the instantaneous speed of each fly within the chamber in 10 msec increments. Analysis software then compiles this data, and outputs a variety of parameters such as average speed, max speed, time spent in motion, acceleration, etc. This protocol will discuss proper feeding and management of flies for behavioral tasks, handling flies without anesthetization or immobilization, setting up a controlled environment, and running the assay from start to finish.

The study of complex locomotor behavior in Drosophila melanogaster is dependent upon the ability to quantify changes in a given fly's movement. This article demonstrates how to do this using a high-resolution tracking system.

عالية الدقة تعقب الفيديو للتنقل في الكبار ذبابة الفاكهة السوداء البطن

Flies provide an important model for studying complex behavior due to the plethora of genetic tools available to researchers in this field.  Studying ...

Drosophila Larval NMJ Immunohistochemistry

The Drosophila neuromuscular junction (NMJ) is an established model system used for the study of synaptic development and plasticity. The widespread use of the Drosophila motor system is due to its high accessibility. It can be analyzed with single-cell resolution. There are 30 muscles per hemisegment whose arrangement within the peripheral body wall are known. A total of 31 motor neurons attach to these muscles in a pattern that has high fidelity. Using molecular biology and genetics, one can create transgenic animals or mutants. Then, one can study the developmental consequences on the morphology and function of the NMJ. Immunohistochemistry can be used to clearly image the components of the NMJ. In this article, we demonstrate how to use antibody staining to visualize the Drosophila larval NMJ.

Drosophila Larval NMJ Immunohistochemistry

This protocol demonstrates how to perform immunohistochemistry on dissected Drosophila larva.

ذبابة الفاكهة اليرقات NMJ المناعية

The Drosophila neuromuscular junction (NMJ) is an established model system used for the study of synaptic development and plasticity. The widespread use ...

Visually Mediated Odor Tracking During Flight in Drosophila

Flying insects use visual cues to stabilize their heading in a wind stream. Many animals additionally track odors carried in the wind. As such, visual stabilization of upwind tracking directly aids in odor tracking. But do olfactory signals directly influence visual tracking behavior independently from wind cues? Additionally, recent advances in olfactory molecular genetics and neurophysiology have motivated novel quantitative behavioral analyses to assess the behavioral influence of (e.g.) genetically inactivating specific olfactory activation circuits. We modified a magnetic tether system originally devised for vision experiments by equipping the arena with narrow laminar flow odor plumes. Here we focus on experiments that can be performed after a fly is tethered and is able to navigate in the magnetic arena. We show how to acquire video images optimized for measuring body angle, how to judge stable odor tracking, and we illustrate two experiments to examine the influence of visual cues on odor tracking.

Here we describe how to optimize the acquired video image for an olfactory magnetic-tether (OMT) apparatus. We also describe two sample experimental protocols for studying visuo-olfactory fusion.

تتبع الرائحة بصريا وساطة خلال الطيران في ذبابة الفاكهة

Flying insects use visual cues to stabilize their heading in a wind stream. Many animals additionally track odors carried in the wind. As such, visual ...

Fluorescent Labeling of Drosophila Heart Structures

The Drosophila melanogaster dorsal vessel, or heart, is a tubular structure comprised of a single layer of contractile cardiomyocytes, pericardial cells that align along each side of the heart wall, supportive alary muscles and, in adults, a layer of ventral longitudinal muscle cells. The contractile fibers house conserved constituents of the muscle cytoarchitecture including densely packed bundles of myofibrils and cytoskeletal/submembranous protein complexes, which interact with homologous components of the extracellular matrix. Here we describe a protocol for the fixation and the fluorescent labeling of particular myocardial elements from the hearts of dissected larvae and semi-intact adult Drosophila. Specifically, we demonstrate the labeling of sarcomeric F-actin and of &alpha;-actinin in larval hearts. Additionally, we perform labeling of F-actin and &alpha;-actinin in myosin-GFP expressing adult flies and of &alpha;-actinin and pericardin, a type IV extracellular matrix collagen, in wild type adult hearts. Particular attention is given to a mounting strategy for semi-intact adult hearts that minimizes handling and optimizes the opportunity for maintaining the integrity of the cardiac tubes and the associated tissues. These preparations are suitable for imaging via fluorescent and confocal microscopy. Overall, this procedure allows for careful and detailed analysis of the structural characteristics of the heart from a powerful genetically tractable model system.

Fluorescent Labeling of Drosophila Heart Structures

Here we describe a basic protocol for fluorescent labeling of different elements of heart tubes from larva and adult Drosophila melanogaster. These specimens are well-suited for imaging via fluorescent or confocal microscopy. This technique permits detailed structural analysis of the features of the hearts from a powerful model organism.

بطاقات المواد الفلورية ذبابة الفاكهة</emهياكل القلب>

The Drosophila melanogaster dorsal vessel, or heart, is a tubular structure comprised of a single layer of contractile cardiomyocytes, pericardial cells ...

Visualizing the Beating Heart in Drosophila

The Drosophila heart has recently emerged as a good model system for examining the genetic, cellular, and molecular mechanisms underlying function in myogenic hearts. A key step in examining heart function in the fly is finding a way to access the heart in a manner that preserves its myogenic function while still allowing the beating heart organ to be observed and recorded. Two different methods for observing and recording the beating heart in both larva and adult Drosophila are described here. Our semi-intact preparation using adult flies allows clear visualization of the abdominal heart without interference from the pigmented cuticle and overlying fat bodies. To record larval heart beats it is necessary to immobilize the larva, which minimizes body wall movements thereby reducing heart movements that are not associated with myocardial contractions. Our methodologies produce stable adult and larval heart preparations that can beat for hours at rates of 1-3 Hz.

Visualizing the Beating Heart in Drosophila

Technique required for visualizing the beating heart in larval and adult Drosophila are presented. Each life stage requires a different methodology.

تصور القلب النابض في ذبابة الفاكهة</em

The Drosophila heart has recently emerged as a good model system for examining the genetic, cellular, and molecular mechanisms underlying function in ...

Preparation of embryos for Electron Microscopy of the Drosophila embryonic heart tube

The morphogenesis of the Drosophila embryonic heart tube has emerged as a valuable model system for studying cell migration, cell-cell adhesion and cell shape changes during embryonic development. One of the challenges faced in studying this structure is that the lumen of the heart tube, as well as the membrane features that are crucial to heart tube formation, are difficult to visualize in whole mount embryos, due to the small size of the heart tube and intra-lumenal space relative to the embryo. The use of transmission electron microscopy allows for higher magnification of these structures and gives the advantage of examining the embryos in cross section, which easily reveals the size and shape of the lumen. In this video, we detail the process for reliable fixation, embedding, and sectioning of late stage Drosophila embryos in order to visualize the heart tube lumen as well as important cellular structures including cell-cell junctions and the basement membrane.

Preparation of embryos for Electron Microscopy of the Drosophila embryonic heart tube

We describe a process for fixation, embedding, sectioning, and imaging of late stage Drosophila embryos for Trasmission Electron Microscopy of the embryonic heart tube. This technique allows for the visualization of the heart tube lumen as well as the basement membrane, which lines the lumen of the heart.

إعداد الأجنة المجهري للإلكترون من ذبابة الفاكهة أنبوب القلب الجنينية

The morphogenesis of the Drosophila  embryonic heart tube has emerged as a valuable model system for studying cell migration, cell-cell adhesion and cell ...

Long-term Lethal Toxicity Test with the Crustacean Artemia franciscana

Our research activities target the use of biological methods for the evaluation of environmental quality, with particular reference to saltwater/brackish water and sediment. The choice of biological indicators must be based on reliable scientific knowledge and, possibly, on the availability of standardized procedures. In this article, we present a standardized protocol that used the marine crustacean Artemia to evaluate the toxicity of chemicals and/or of marine environmental matrices. Scientists propose that the brine shrimp (Artemia) is a suitable candidate for the development of a standard bioassay for worldwide utilization. A number of papers have been published on the toxic effects of various chemicals and toxicants on brine shrimp (Artemia). The major advantage of this crustacean for toxicity studies is the overall availability of the dry cysts; these can be immediately used in testing and difficult cultivation is not demanded1,2. Cyst-based toxicity assays are cheap, continuously available, simple and reliable and are thus an important answer to routine needs of toxicity screening, for industrial monitoring requirements or for regulatory purposes3. The proposed method involves the mortality as an endpoint. The numbers of survivors were counted and percentage of deaths were calculated. Larvae were considered dead if they did not exhibit any internal or external movement during several seconds of observation4. This procedure was standardized testing a reference substance (Sodium Dodecyl Sulfate); some results are reported in this work. This article accompanies a video that describes the performance of procedural toxicity testing, showing all the steps related to the protocol.

Long-term Lethal Toxicity Test with the Crustacean Artemia franciscana

This study concerns the development and standardization of a valuable methodological protocol to determine long-term (14 days) lethal toxicity exerted by chemical substances, industrial wastewater or sewage and liquid environmental samples on the saltwater crustacean, Artemia franciscana.

على المدى الطويل اختبار السمية المهلكة مع القشريات الأرتيميا franciscana</em

Our research activities target the use of biological methods for the evaluation of environmental quality, with particular reference to saltwater/brackish ...

Measurement of Lifespan in Drosophila melanogaster

Aging is a phenomenon that results in steady physiological deterioration in nearly all organisms in which it has been examined, leading to reduced physical performance and increased risk of disease. Individual aging is manifest at the population level as an increase in age-dependent mortality, which is often measured in the laboratory by observing lifespan in large cohorts of age-matched individuals. Experiments that seek to quantify the extent to which genetic or environmental manipulations impact lifespan in simple model organisms have been remarkably successful for understanding the aspects of aging that are conserved across taxa and for inspiring new strategies for extending lifespan and preventing age-associated disease in mammals.
The vinegar fly, Drosophila melanogaster, is an attractive model organism for studying the mechanisms of aging due to its relatively short lifespan, convenient husbandry, and facile genetics. However, demographic measures of aging, including age-specific survival and mortality, are extraordinarily susceptible to even minor variations in experimental design and environment, and the maintenance of strict laboratory practices for the duration of aging experiments is required. These considerations, together with the need to practice careful control of genetic background, are essential for generating robust measurements. Indeed, there are many notable controversies surrounding inference from longevity experiments in yeast, worms, flies and mice that have been traced to environmental or genetic artifacts1-4. In this protocol, we describe a set of procedures that have been optimized over many years of measuring longevity in Drosophila using laboratory vials. We also describe the use of the dLife software, which was developed by our laboratory and is available for download (<a href="http://sitemaker.umich.edu/pletcherlab/software">http://sitemaker.umich.edu/pletcherlab/software</a>). dLife accelerates throughput and promotes good practices by incorporating optimal experimental design, simplifying fly handling and data collection, and standardizing data analysis. We will also discuss the many potential pitfalls in the design, collection, and interpretation of lifespan data, and we provide steps to avoid these dangers.

Measurement of Lifespan in Drosophila melanogaster

Drosophila melanogaster is a powerful model organism for exploring the molecular basis of longevity regulation. This protocol will discuss the steps involved in generating a reproducible, population-based measurement of longevity as well as potential pitfalls and how to avoid them.

قياس عمر في<em&gt; ذبابة الفاكهة الدروسوفيلا</em

Aging is a phenomenon that results in steady physiological deterioration in nearly all organisms in which it has been examined, leading to reduced ...

Drosophila Preparation and Longitudinal Imaging of Heart Function In Vivo Using Optical Coherence Microscopy (OCM)

Longitudinal study of the heartbeat in small animals contributes to understanding structural and functional changes during heart development. Optical coherence microscopy (OCM) has been demonstrated to be capable of imaging small animal hearts with high spatial resolution and ultrahigh imaging speed. The high image contrast and noninvasive properties make OCM ideal for performing longitudinal studies without requiring tissue dissections or staining. Drosophila has been widely used as a model organism in cardiac developmental studies due to its high number of orthologous human disease genes, its similarity of molecular mechanisms and genetic pathways with vertebrates, its short life cycle, and its low culture cost. Here, the experimental protocols are described for the preparation of Drosophila and optical imaging of the heartbeat with a custom OCM system throughout the life cycle of the specimen. By following the steps provided in this report, transverse M-mode and 3D OCM images can be acquired to conduct longitudinal studies of the Drosophila cardiac morphology and function. The en face and axial sectional OCM images and the heart rate (HR) and cardiac activity period (CAP) histograms, were also shown to analyze the heart structural changes and to quantify the heart dynamics during Drosophila metamorphosis, combined with the videos constructed with M-mode images to trace cardiac activity intuitively. Due to the genetic similarity between Drosophila and vertebrates, longitudinal study of heart morphology and dynamics in fruit flies could help reveal the origins of human heart diseases. The protocol here would provide an effective method to perform a wide range of studies to understand the mechanisms of cardiac diseases in humans.

Drosophila Preparation and Longitudinal Imaging of Heart Function In Vivo Using Optical Coherence Microscopy OCM

Here, the experimental protocols are described for preparing Drosophila at different developmental stages and performing longitudinal optical imaging of Drosophila heartbeats using a custom optical coherence microscopy (OCM) system. The cardiac morphological and dynamical changes can be quantitatively characterized by analyzing the heart structural and functional parameters from OCM images.

إعداد ذبابة الفاكهة والتصوير الطولي من وظيفة القلب في فيفو باستخدام البصرية بالاتساق المجهري (OCM)

Longitudinal study of the heartbeat in small animals contributes to understanding structural and functional changes during heart development. Optical ...