Vorremmo ringraziare la Fondazione canadese per l&#39;innovazione, la British Columbia Fondo di conoscenza per lo sviluppo e la Nazionale di Scienze e Ingegneria Research Council (NSERC) del Canada per sostenere gli studi in corso sulle regioni di scarsità di ossigeno delle acque costiere oceaniche e aperto. Inoltre, DAW è stata sostenuta da borse di studio da NSERC, Killam e la fondazione TULA Centro finanziato per la diversità microbica e Evolution.

Parte 1: raccolta delle acque <ol><li> Fondali sono assegnati ad ogni cast. </li><li> Profondità da campionare e il volume totale da raccogliere per il cast di corrente sono determinati. </li><li> E &#39;garantito che il Go-Flo e bottiglie Niskin sono aperti e che le valvole ei rubinetti sono chiusi. </li><li> Il CTD viene caricato sul fondo della linea e inferiore in acqua. </li><li> Una bottiglia per la profondità campionate nel primo cast viene caricato sulla linea dopo il CTD, ma è garantito che la linea sia inserito correttamente nel supporto e le viti sono serrate. </li><li> Un messaggero è allegato ad ogni bottiglia (se non il più profondo) prima di abbassare. </li><li> La linea si abbassa la distanza tra la profondità prima e la successiva; un&#39;altra bottiglia viene poi caricata. Va notato che per profondità, dove sono raccolti 20L per la filtrazione, per un totale di 2 bottiglie 12L sono caricati consecutivamente circa 0,75 m di distanza. </li><li> Una volta che tutte le bottiglie sono in linea, la linea si abbassa fino alla profondità desiderata e 2 minuti sono autorizzati a passare. </li><li> Un messaggero viene inviato verso il basso e pochi minuti sono autorizzati a passare per assicurare che tutti i vicini bottiglie. </li><li> La linea è annaspato e le bottiglie vengono scaricati via via emergenti sul rack. </li><li> Per profondità che richiedono campioni 20L per DNA e RNA, due bottiglie Niskin vengono raccolti. Una bottiglia è usato per esempio i parametri chimici (vedi sotto), mentre l&#39;altra è prosciugato in damigiana. RNA è raccolto immediatamente dal Niskin secondo. Il resto del primo è anche drenato in damigiana per dare ~ volume di 20L finale. Per bassa risoluzione campioni solo 1L di acqua viene messa da parte per la filtrazione sterile in bottiglie Nalgene. </li></ol> Parte 2: raccolta dei campioni di gas <ol><li> Se i campioni di ossigeno sono necessari, sono raccolti per primo. </li><li> Un pezzo di tubo sottile è collegato al Niskin / Go-Flo rubinetto e l&#39;altra estremità del tubo è posizionato posto in bottiglie di siero del vetro. </li><li> La bottiglia siero è risciacquata con acqua 3 volte campione, e riempito fino a traboccare in modo che non siano presenti bolle d&#39;aria. </li><li> 50μl di cloruro di mercurio (HgCl 2) vengono aggiunti alla bottiglia siero in un modo che non introduce bolle d&#39;aria nel campione. </li><li> La bottiglia è sigillata con un tappo di gomma e crimpati con una ghiera di alluminio, e viene quindi memorizzato sul ghiaccio in un dispositivo di raffreddamento. </li></ol> Parte 3: la raccolta dei campioni di nutrienti <ol><li> Una siringa da 60 cc è risciacquata con acqua campione, un (0,2 micron) è collegato in linea e l&#39;acqua viene spinta attraverso il Acrodisc. </li><li> Una bottiglia in polietilene è risciacquata con ~ 10 ml di acqua filtrata 3 volte (agitare bottiglia quando il risciacquo). </li><li> Campione di acqua filtrata viene aggiunto alle bottiglie, circa ¾. </li><li> Il campione viene memorizzato sul ghiaccio nel radiatore. </li></ol> Parte 4: esempio di raccolta ammoniaca <ol><li> Provette vengono sciacquati con acqua campione. </li><li> Provette sono riempiti completamente con acqua campione. </li><li> 5 ml di acqua campione sono portati con l&#39;ausilio di una pipetta da 10 ml, il resto dell&#39;acqua nel tubo viene scartata e il 5 ml a la punta della pipetta sono sostituiti nella provetta del campione. </li><li> 7.5ml di reagente di ammonio di lavoro è aggiunto ad ogni provetta una volta campioni provenienti da tutte le profondità sono stati raccolti. </li></ol> Parte 5: Raccolta dei campioni per il conteggio delle cellule <ol><li> Un pre-etichettati tubo Falcon da 50 ml contenente 5,4 ml di formaldeide al 37% è riempito in cima per una concentrazione finale del 4%. Si fa attenzione a non rovesciare. </li></ol> Parte 6: Raccolta dei campioni per le misurazioni di idrogeno solforato <ol><li> Un pre-etichettati tubo Falcon da 50 ml contiene acetato di zinco 20% (Zn (O 2 CCH 3) 2) si riempie verso l&#39;alto. Si fa attenzione a non rovesciare. </li></ol> Parte 7: raccolta di piccolo volume per la concentrazione della biomassa <ol><li> Bottiglie da 1 litro sono riempiti fino alla cima. </li></ol> Parte 8: raccolta di grande volume per la concentrazione della biomassa <ol><li> Damigiane da 20 litri sono pieni. </li></ol> Parte 9: Risultati Rappresentante Il risultato finale di campionamento di acqua di mare si traduce in circa 12 campioni di ossigeno disciolto, 32-48 campioni di gas, 16 campioni di nutrienti, 32 campioni di ammonio, acido solfidrico 16 campioni, 16 campioni per la conta delle cellule, 6 damigiane da 20 litri, 16 bottiglie da 1 litro e 4 Sterivex 0.22μm filtri contenenti biomassa microbica conservato con RNA più tardi.

<ol>
	<li>Cline, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spectrophotometric+determination+of+hydrogen+sulfide+in+natural+waters.">Spectrophotometric determination of hydrogen sulfide in natural waters.</a> Limnology &#38; Oceanography. 14, 454-458 (1969).</li><li>Holmes, R. M., Aminot, A., Kerouel, R., Hooker, B. A., Peterson, B. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+and+precise+method+for+measuring+ammonium+in+marine+and+freshwater+ecosystems.">A simple and precise method for measuring ammonium in marine and freshwater ecosystems.</a> Canadian Journal of fisheries and Aquatic Science. 56, 1801-1808 (1999).</li></ol>

The authors have nothing to disclose.

In generale, c&#39;è una grande quantità di preparazione e di pianificazione necessari per questo tipo di campionamento, in modo bilancio 2 giorni prima del viaggio per ottenere le cose in ordine e un giorno dopo, per la pulizia di tutto. In generale, non lasciare che l&#39;acqua salata entrare in contatto con la pompa peristaltica o nel box in alluminio Zarges usato per trasportare l&#39;attrezzatura campo. Trattare l&#39;apparecchio con rispetto e che si esibirà anche per lungo tempo a venire.

<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>20L Carboys</td>
<td>&nbsp;</td>
<td>Fisher</td>
<td>02-960-15</td>
<td>&nbsp;</td>
<tr>
<td>3/8" Tygon</td>
<td>&nbsp;</td>
<td>Cole Parmer</td>
<td>06429-36</td>
<td>&nbsp;</td>
<tr>
<td>Sterivex filters</td>
<td>&nbsp;</td>
<td>Fisher</td>
<td>SVG010RS</td>
<td>&nbsp;</td>
<tr>
<td>Prefilter Housing Unit</td>
<td>&nbsp;</td>
<td>AMD</td>
<td>501200</td>
<td>&nbsp;</td>
<tr>
<td>Luer Fitting</td>
<td>&nbsp;</td>
<td>Cole Parmer</td>
<td>31507-27</td>
<td>&nbsp;</td>
<tr>
<td>1/4" Tygon tubing</td>
<td>&nbsp;</td>
<td>Cole Parmer</td>
<td>06429-24</td>
<td>&nbsp;</td>
<tr>
<td>1/4" Tygon tubing</td>
<td>&nbsp;</td>
<td>Cole Parmer</td>
<td>06429-24</td>
<td>&nbsp;</td>
<tr>
<td>1/4" Tygon tubing</td>
<td>&nbsp;</td>
<td>Cole Parmer</td>
<td>06429-24</td>
<td>&nbsp;</td>
<tr>
<td>50ml Plastic tubes</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Glass Serum Bottles</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Glass Sample Collection</td>
</tr>
<tr>
<td>Septa and aluminum caps for glass serum bottles</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Hand Crimper</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>20-200ul Pipette and Tips</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Glass Tubes</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Ammonium Sample Collection</td>
</tr>
<tr>
<td>30ml Plastic Bottles</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Nutrient Collection</td>
</tr>
<tr>
<td>Acrodisc Filters</td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>5 ml Tubes</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Nitrite Sample Collection</td>
</tr>
<tr>
<td>37% Formaldehyde</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>For cell count samples</td>
</tr>
<tr>
<td>20% Zinc Acetate</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>For sulfide samples</td>
</tr>
<tr>
<td>Mercuric Chloride</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>For gas samples</td>
</tr>
<tr>
<td>milliQ water</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Ammonium Working Reagent</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Borate buffer, sodium sulfite, orthophaladialdehyde</td>
</tr>
<tr>
<td>Sulfanilamide</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>5g into 450ml water and 50ml HCl</td>
</tr>
<tr>
<td>N-(1-naphthy)-ethylenediamine dihydrochloride solution</td>
<td>Reagent</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>0.5g into 500ml water</td>
</tr>
</tbody>
</table>

seawater sampling and collection

Questo video documenta i metodi per la raccolta di campioni di acqua marina costiera e il loro trattamento per varie applicazioni a valle compresa la concentrazione della biomassa, purificazione degli acidi nucleici, l&#39;abbondanza delle cellule, nutriente e analisi gas tracciante. Per i campioni manifestazione di oggi sono stati raccolti dal ponte della HMS operativo John Strickland a Inlet Saanich. Un A-frame Derrick, con un multi-purpose verricello e sistema di cavi, viene usato in combinazione con Niskin o Go-Flo bottiglie di campionamento delle acque. Conducibilità, temperatura e profondità (CTD) sensori sono utilizzati anche per esempio la massa d&#39;acqua sottostante. Per ridurre al minimo degassamento, campioni di gas traccia sono raccolti per primo. Poi, i nutrienti, chimica dell&#39;acqua, e conta delle cellule sono determinate. Infine, le acque sono raccolte per la filtrazione delle biomasse. Il set-up e tempi di raccolta per un singolo getto è ~ 1,5 ore ad una profondità massima di 215 metri. Pertanto, per un totale di 6 ore è generalmente necessario a completare la serie di raccolta qui descritto.

Watch this Scientific Journal Video about Seawater Sampling and Collection at JoVE.com

Seawater Sampling and Collection

Questo video documenta i metodi per la raccolta di campioni di acqua marina costiera e il loro trattamento per varie applicazioni a valle compresa la concentrazione della biomassa, purificazione degli acidi nucleici, l&#39;abbondanza delle cellule, nutriente e analisi gas tracciante.

Campionamento di acqua di mare e di raccolta

This video documents methods for collecting coastal marine water samples and processing them for various downstream applications including biomass ...

Research

JoVE Journal

Biology

19.9K Views.  University of British Columbia - UBC. Questo video documenta i metodi per la raccolta di campioni di acqua marina costiera e il loro trattamento per varie applicazioni a valle compresa la concentrazione della biomassa, purificazione degli acidi nucleici, l'abbondanza delle cellule, nutriente e analisi gas tracciante.

Video: Seawater Sampling and Collection

Collection and Cryopreservation of Hamster Oocytes and Mouse Embryos

Embryos and oocytes were first successfully cryopreserved more than 30 years ago, when Whittingham et al. 1 and Wilmut 2 separately described that mouse embryos could be frozen and stored at -196 &deg;C and, a few years later, Parkening et al. 3 reported the birth of live offspring resulting from in vitro fertilization (IVF) of cryopreserved oocytes. Since then, the use of cryopreservation techniques has rapidly spread to become an essential component in the practice of human and animal assisted reproduction and in the conservation of animal genetic resources. Currently, there are two main methods used to cryopreserve oocytes and embryos: slow freezing and vitrification. A wide variety of approaches have been used to try to improve both techniques and millions of animals and thousands of children have been born from cryopreserved embryos. However, important shortcomings associated to cryopreservation still have to be overcome, since ice-crystal formation, solution effects and osmotic shock seem to cause several cryoinjuries in post-thawed oocytes and embryos. Slow freezing with programmable freezers has the advantage of using low concentrations of cryoprotectants, which are usually associated with chemical toxicity and osmotic shock, but their ability to avoid ice-crystal formation at low concentrations is limited. Slow freezing also induces supercooling effects that must be avoided using manual or automatic seeding 4. In the vitrification process, high concentrations of cryoprotectants inhibit the formation of ice-crystals and lead to the formation of a glasslike vitrified state in which water is solidified, but not expanded. However, due to the toxicity of cyroprotectants at the concentrations used, oocytes/embryos can only be exposed to the cryoprotectant solution for a very short period of time and in a minimum volume solution, before submerging the samples directly in liquid nitrogen 5. In the last decade, vitrification has become more popular because it is a very quick method in which no expensive equipment (programmable freezer) is required. However, slow freezing continues to be the most widely used method for oocyte/embryo cryopreservation. In this video-article we show, step-by-step, how to collect and slowly freeze hamster oocytes with high post-thaw survival rates. The same procedure can also be applied to successfully freeze and thaw mouse embryos at different stages of preimplantation development.

In this video-article we present a step-by-step demonstration on how to collect and cryopreserve hamster oocytes with high post-thaw survival rates. The same procedure can also be applied to successfully freeze and thaw mouse embryos at different stages of preimplantation development.

Raccolta e Crioconservazione degli ovociti e di embrioni di topo criceto

Embryos and oocytes were first successfully cryopreserved more than 30 years ago, when Whittingham et al. 1 and Wilmut 2 separately described that mouse ...

Ricerca

Biologia

Large Volume (20L+) Filtration of Coastal Seawater Samples

The workflow begins with the collection of coastal marine waters for downstream microbial community, nutrient and trace gas analyses. For this method, samples were collected from the deck of the HMS John Strickland operating in Saanich Inlet. This video documents large volume (&ge;20 L) filtration of microbial biomass, ranging between 0.22&mu;m and 2.7&mu;m in diameter, from the water column. Two 20L samples can be filtered simultaneously using a single pump unit equipped with four rotating heads. Filtration is done in the field on extended trips, or immediately upon return for day trips. It is important to record the amount of water passing through each sterivex filter unit. To prevent biofilm formation between sampling trips, all filtration equipment must be rinsed with dilute HCl and deionized water and autoclaved immediately after use. This procedure will take approximately 5 hours plus an additional hour for clean up.

Large Volume 20L+ Filtration of Coastal Seawater Samples

This video documents large volume (&ge;20 L) filtration of microbial biomass, ranging between 0.22&mu;m and 2.7&mu;m in diameter, from the water column.

Volume di grandi dimensioni (20L +) Filtrazione di campioni d&#39;acqua di mare costiero

The workflow begins with the collection of coastal marine waters for downstream microbial community, nutrient and trace gas analyses. For this method, ...

Small Volume (1-3L) Filtration of Coastal Seawater Samples

The workflow begins with the collection of coastal marine waters for downstream microbial community, nutrient and trace gas analyses. For today s demonstration samples were collected from the deck of the HMS John Strickland operating in Saanich Inlet. This video documents small volume (~1 L) filtration of microbial biomass from the water column. The protocol is an extension of the large volume sampling protocol described earlier, with one major difference: here, there is no pre-filtration step, so all size classes of biomass are collected down to the 0.22 &mu;m filter cut-off. Samples collected this way are ideal for nucleic acid analysis. The set-up, filtration, and clean-up steps each take about 20-30 minutes. If using two peristaltic pumps simultaneously, up to 8 samples may be filtered at the same time. To prevent biofilm formation between sampling trips, all filtration equipment must be rinsed with dilute HCl and deionized water and autoclaved immediately after use.

Small Volume 1-3L Filtration of Coastal Seawater Samples

This video documents small volume (~1 L) filtration of microbial biomass from the water column.

Volume piccoli (1-3L) Filtrazione di campioni d&#39;acqua di mare costiero

The workflow begins with the collection of coastal marine waters for downstream microbial community, nutrient and trace gas analyses. For today s ...

Diagnostic Necropsy and Selected Tissue and Sample Collection in Rats and Mice

There are multiple sample types that may be collected from a euthanized animal in order to help diagnose or discover infectious agents in an animal colony. Proper collection of tissues for further histological processing can impact the quality of testing results. This article describes the conduct of a basic gross examination including identification of heart, liver, lungs, kidneys, and spleen, as well as how to collect those organs. Additionally four of the more difficult tissue/sample collection techniques are demonstrated. Lung collection and perfusion can be particularly challenging as the tissue needs to be properly inflated with a fixative in order for inside of the tissue to fix properly and to enable thorough histologic evaluation. This article demonstrates the step by step technique to remove the lung and inflate it with fixative in order to achieve optimal fixation of the tissue within 24 hours. Brain collection can be similarly challenging as the tissue is soft and easily damaged. This article demonstrates the step by step technique to expose and remove the brain from the skull with minimal damage to the tissue. The mesenteric lymph node is a good sample type in which to detect many common infectious agents as enteric viruses persist longer in the lymph node than they are shed in feces. This article demonstrates the step by step procedure for locating and aseptically removing the mesenteric lymph node. Finally, identification of infectious agents of the respiratory tract may be performed by bacterial culture or PCR testing of nasal and/or bronchial fluid aspirates taken at necropsy. This procedure describes obtaining and preparing the respiratory aspirate sample for bacterial culture and PCR testing.

This article describes the procedures for conducting a basic postmortem examination of a mouse or rat, and the collection of basic organs, as well as more challenging sample types from for histological, microbiological, and PCR evaluation.

Necroscopia diagnostica e selezionati Collezione di tessuti e campioni di ratti e topi

There are multiple sample types that may be collected from a euthanized animal in order to help diagnose or discover infectious agents in an animal ...

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Animal models are commonly used throughout research laboratories to accomplish what would normally be considered impractical in a pathogen&#8217;s native host. Milk collection from animals allows scientists the opportunity to study many aspects of reproduction including vertical transmission, passive immunity, mammary gland biology, and lactation. Obtaining adequate volumes of milk for these studies is a challenging task, especially from small animal models. Here we illustrate an inexpensive and facile method for milk collection in mice and Reeves&#8217; muntjac deer that does not require specialized equipment or extensive training. This particular method requires two researchers: one to express the milk and to stabilize the animal, and one to collect the milk in an appropriate container from either a Muntjac or mouse model. The mouse model also requires the use of a P-200 pipetman and corresponding pipette tips. While this method is low cost and relatively easy to perform, researchers should be advised that anesthetizing the animal is required for optimal milk collection.

Milk Collection Methods for Mice and Reeves&#039; Muntjac Deer

Milk collection from animal models facilitates various research avenues: understanding passive immunity, identifying pathogens responsible for vertical transmission and, through the use of transgenic mice, even commercial production of proteins found in human breast milk. Here we illustrate a simple method for milk collection in mice and Reeves&#8217; muntjac deer.

Metodi Latte di raccolta per topi e Reeves &#39;Muntjac

Animal models are commonly used throughout research laboratories to accomplish what would normally be considered impractical in a pathogen&#8217;s native ...

Non-Terminal Blood Sampling Techniques in Guinea Pigs

Guinea pigs possess several biological similarities to humans and are validated experimental animal models1-3. However, the use of guinea pigs currently represents a relatively narrow area of research and descriptive data on specific methodology is correspondingly scarce. The anatomical features of guinea pigs are slightly different from other rodent models, hence modulation of sampling techniques to accommodate for species-specific differences, e.g., compared to mice and rats, are necessary to obtain sufficient and high quality samples. As both long and short term in vivo studies often require repeated blood sampling the choice of technique should be well considered in order to reduce stress and discomfort in the animals but also to ensure survival as well as compliance with requirements of sample size and accessibility. Venous blood samples can be obtained at a number of sites in guinea pigs e.g., the saphenous and jugular veins, each technique containing both advantages and disadvantages4,5. Here, we present four different blood sampling techniques for either conscious or anaesthetized guinea pigs. The procedures are all non-terminal procedures provided that sample volumes and number of samples do not exceed guidelines for blood collection in laboratory animals6. All the described methods have been thoroughly tested and applied for repeated in vivo blood sampling in studies within our research facility.

Though a known model, the guinea pig currently represents a niche in experimental animal sciences and limited data is available on the execution of most procedures. Here we present four different approaches to non-terminal in vivo blood sampling techniques in either conscious or anaesthetized guinea pigs.

Non terminale Tecniche di prelievo di sangue in Guinea Pigs

Guinea pigs possess several biological similarities to humans and are validated experimental animal models1-3. However, the use of guinea pigs currently ...

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.

Prelievo di sangue dalla vena della coda laterale del Topo

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

Collection and Identification of Pollen from Honey Bee Colonies

Researchers often collect and analyze corbicular pollen from honey bees to identify the plant sources on which they forage for pollen or to estimate pesticide exposure of bees via pollen. Described herein is an effective pollen-trapping method for collecting corbicular pollen from honey bees returning to their hives. This collection method results in large quantities of corbicular pollen that can be used for research purposes. Honey bees collect pollen from many plant species, but typically visit one species during each collection trip. Therefore, each corbicular pollen pellet predominantly represents one plant species, and each pollen pellet can be described by color. This allows the sorting of samples of corbicular pollen by color to segregate plant sources. Researchers can further classify corbicular pollen by analyzing the morphology of acetolyzed pollen grains for taxonomic identification. These methods are commonly used in studies related to pollinators such as pollination efficiency, pollinator foraging dynamics, diet quality, and diversity. Detailed methodologies are presented for collecting corbicular pollen using pollen traps, sorting pollen by color, and acetolyzing pollen grains. Also presented are results pertaining to the frequency of pellet colors and taxa of corbicular pollen collected from honey bees in five different cropping systems.

We describe methods for collecting corbicular pollen from honey bees as well as protocols for color sorting, acetolysis, and microscope slide preparation of pollen for taxonomic identification. In addition, we present pellet color and taxonomic diversity of corbicular pollen collected from five cropping systems using pollen traps.

Raccolta e identificazione del polline dalle colonie di api da miele

Researchers often collect and analyze corbicular pollen from honey bees to identify the plant sources on which they forage for pollen or to estimate ...

Cryo-Electron Tomography Remote Data Collection and Subtomogram Averaging

Cryo-electron tomography (cryo-ET) has been gaining momentum in recent years, especially since the introduction of direct electron detectors, improved automated acquisition strategies, preparative techniques that expand the possibilities of what the electron microscope can image at high-resolution using cryo-ET and new subtomogram averaging software. Additionally, data acquisition has become increasingly streamlined, making it more accessible to many users. The SARS-CoV-2 pandemic has further accelerated remote cryo-electron microscopy (cryo-EM) data collection, especially for single-particle cryo-EM, in many facilities globally, providing uninterrupted user access to state-of-the-art instruments during the pandemic. With the recent advances in Tomo5 (software for 3D electron tomography), remote cryo-ET data collection has become robust and easy to handle from anywhere in the world. This article aims to provide a detailed walk-through, starting from the data collection setup in the tomography software for the process of a (remote) cryo-ET data collection session with detailed troubleshooting. The (remote) data collection protocol is further complemented with the workflow for structure determination at near-atomic resolution by subtomogram averaging with emClarity, using apoferritin as an example.

The present protocol describes high-resolution cryo-electron tomography remote data acquisition using Tomo5 and subsequent data processing and subtomogram averaging using emClarity. Apoferritin is used as an example to illustrate detailed step-by-step processes to achieve a cryo-ET structure at 2.86 &#197; resolution.

Tomografia crioelettronica Raccolta dati remota e media dei sottotomogrammi

Cryo-electron tomography (cryo-ET) has been gaining momentum in recent years, especially since the introduction of direct electron detectors, improved ...