The authors would like to acknowledge support from the Government of Canada's interdepartmental Program of Energy Research and Development, PERD 113, Petroleum Conversion for Cleaner Air. N.E.H would like to acknowledge her Natural Sciences and Engineering Research Council of Canada Visiting Fellowship.

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The authors have nothing to disclose.

من أجل تحقيق القياس الأمثل لH 2 S، وهذا الأسلوب يستخدم مفتاح عمداء، backflushing وكشف عن التوهج الكبريت (SCD). ويستخدم العمود dimethylpolysiloxane كأول عمود البعد GC، ويعمل على إعاقة حركة الهيدروكربونات الأثقل الموجودة في العينة بحيث لا تلوث العمود المؤامرة. ومما يعزز هذا التأثير ...

تحليل دقيق للنفط الخام أمر ضروري لصناعة النفط والغاز، والأنظمة واقتصاديات الصحة والسلامة هي وظائف ذات نوعية النفط. من أجل حماية نقل العينات الخام، فمن الضروري تحديد خصائص العينات الخام لتطوير أنظمة السلامة لتنفيذها في حال إطلاق سراح المتهم أو التسرب. على وجه الخصوص، وتحديد حجم كبريتيد الهيدروجين (H 2 S) هو المهم، نظرا لسميته العالية في الطور الغازي. التعرض منخفضة تصل إلى 100 ​​جزء في المليون يمكن أن تكون قاتلة (http://www.cdc.gov/niosh/idlh/7783064.html) 1،2. ويعتبر المنحل H 2 S في عينات الخام عموما أن يكون تآكل 3،4، ويمكن تنشيط المواد الحفازة المستخدمة لعلاج النفط 5-7. إزالة H 2 S من تيارات النفط الخام مثالية، ولكن دون وسيلة لقياس المنحل H 2 S، فإنه من الصعب تقييم مدى نجاح العلاج لإزالة. لهذه الأسباب، وقد وضعت هذا البروتوكول لقياس dissolved H 2 S في عينات النفط الخام الثقيلة مثل الرمال النفطية الكندية خامات. ويوجد عدد من الطرق القياسية لتقدير حجم H 2 S في عينات البترول أو الوقود استنادا أخف وزنا، ولكن لم يتم التحقق من صحة أي للاستخدام مع الخامات الثقيلة المستخرجة عادة من الرمال النفطية الكندية. يتم تحديد H 2 S والمركبتان باستخدام تقنية المعايرة التي كتبها العالمي للمنتجات النفط (UOP) طريقة 163 8، ولكن يعاني هذا الأسلوب من التحيز المستخدم التفسير الذي ينتج من القراءة اليدوية من منحنيات المعايرة. يستخدم معهد البترول (IP) طريقة 570 تخصص H 2 S محلل أن ارتفاع درجات الحرارة عينات زيت الوقود 9، ويستفيد من البساطة وقابلية، لكنه يفتقر الى الدقة مع عينات أثقل 10. الجمعية الأمريكية للاختبارات والمواد (ASTM) طريقة D5623 يستخدم اللوني للغاز (GC) مع التبريد المبردة والكبريت الكشف الانتقائي لقياس H 2 S في السوائل النفطية الخفيفة11،12. ويمكن تحسين هذا المعيار لاستخدام العازل المحيط وأيضا أن تطبق على النفط الخام الأثقل، لذلك كان يستخدم كأساس لبروتوكول مناقشتها هنا. GC هو أسلوب يستخدم بشكل كبير لتحليل عينات البترول. يتم تبخيرها العينات في مدخل الساخنة، ويحدث فصل في الطور الغازي. فصل الطور الغازي GC يجعل مثالية لتحليل H 2 S، كما تتحرر بسهولة من العينة السائلة أثناء التسخين في المدخل. طرق GC يمكن إنشاؤها خصيصا لعينات مختلفة، اعتمادا على برامج درجة الحرارة المستخدمة، والأعمدة تنفيذها، واستخدام اللوني متعدد الأبعاد 13-15. كان هناك عدد من التطورات الأخيرة لقياس H 2 S باستخدام GC. لونغ وآخرون أظهرت H 2 S وغيرها من قياس مركب الكبريت الخفيف في ضوء ونواتج التقطير باستخدام GC متعدد الأبعاد وعمداء التبديل، ولكن الطريقة لميتم تطبيقها على أثقل خامات 16. دي سانزو وآخرون. H كميا أيضا 2 S في البنزين باستخدام GC، إلا أنه أيضا لم يتم استخدامه على الخامات الثقيلة، ويتطلب تبريد 17 الفرعية المحيطة. طريقة عرض هنا يوضح قتا طويلا إنقاذ أكثر هذه الأساليب السابقة، مع فترة التحليل الكامل لمدة 5 دقائق، مقارنة ب 10 دقيقة (لونج) و 40 دقيقة (دي سانزو). للأسف، كان تنفيذ هذه الطرق في مختبرنا لمقارنة دقة يكن من الممكن بسبب المعدات والوقت القيود. GC متعدد الأبعاد يسمح للمستخدم لاستغلال الانتقائية من عمودين، بدلا من عمود واحد. في GC التقليدية، يحدث الانفصال على عمود واحد. في حالة GC متعدد الأبعاد، يتم فصل العينة على عمودين المختلفة، وتعزيز الفصل والانتقائية. مفتاح عمداء هو جهاز واحد يستخدم لتوظيف تكوين عمود ثنائي الأبعاد. يستخدم مفتاح صمام الخارجي لخيمةتدفق الغاز ط م من مدخل على التحول الى واحد من اثنين من الموانئ منفذ 18-20. النفايات السائلة من العمود الأول يمكن أن توجه في أي من الاتجاهين. في هذه الحالة، غازات الكبريت الخفيفة هي &quot;قطع القلب&quot; 21 من الفصل الأول إلى طبقة مسامية أنبوبي المفتوحة (مؤامرة) عمود الفصل الثانوي، وهو ما ثبت لتكون ممتازة لفصل H 2 S من غيره من غازات الكبريت الخفيف (http://www.chem.agilent.com/cag/cabu/pdf/gaspro.pdf) 22-24. ويستخدم للكشف عن التوهج الكبريت للكشف، وتوفير الانتقائية لمركبات الكبريت والقضاء على تدخل محتمل من أي الغازات الخفيفة الأخرى التي قد تم نقلها إلى العمود مؤامرة خلال قطع القلب. يتم الاحتفاظ الهيدروكربونات من العينة النفط الخام على عمود البعد الأول وتتم إزالة أثناء إجراء backflush. هذا يحمي العمود مؤامرة من أي تلوث 25-27. كما تم تنفيذ هذا النهج بنجاح لالشرجيسيس مثبطات أكسدة في زيوت المحولات 28. هنا، يتم توظيف طريقة GC ثنائي الأبعاد لتحليل وتقدير حجم المذاب H 2 S في عينات النفط الخام الثقيل. يتم عرض طريقة قابلة للتطبيق على نطاق واسع من H 2 S تركيزات، ويمكن أيضا أن تستخدم لقياس H 2 S في عينات المرحلة الغازية.

<table border="0" cellpadding="0" cellspacing="0" width="700">
	<tbody>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Deans switch</td>
			<td style="width:199px;">Agilent</td>
			<td style="width:119px;">G2855A</td>
			<td style="width:167px;">Or equivalent flow switching device</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Restrictor tubing&#160;</td>
			<td style="width:199px;">Agilent</td>
			<td style="width:119px;">160-2615-10</td>
			<td style="width:167px;">Fused silica, deactivated, 180 &#181;m</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">HP-PONA column</td>
			<td style="width:199px;">Agilent</td>
			<td style="width:119px;">19091S-001</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">GasPro column</td>
			<td style="width:199px;">Agilent</td>
			<td style="width:119px;">113-4332</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Sulfur chemiluminescence detector, 355</td>
			<td style="width:199px;">Agilent/Sievers</td>
			<td style="width:119px;">G6603A</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:216px;">H2S calibration standard, in He</td>
			<td style="width:199px;">Air Liquide</td>
			<td style="width:119px;">Custom order</td>
			<td style="width:167px;">211 ppm H2S</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:216px;">CS2</td>
			<td style="width:199px;">Fisher Scientific</td>
			<td style="width:119px;">C184-500</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Toluene, HPLC grade</td>
			<td style="width:199px;">Fisher Scientific</td>
			<td style="width:119px;">T290-4</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Gas bag, 2 L</td>
			<td style="width:199px;">Calibrated Instruments, Inc.</td>
			<td style="width:119px;">GSB-P/2</td>
			<td style="width:167px;">Twist on/off nozzle</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">250 &#181;L gas tight syringe</td>
			<td style="width:199px;">Hamilton</td>
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measurement of h2s in crude oil and crude oil headspace using multidimensional gas chromatography, deans switching and sulfur-selective detection

وهناك طريقة لتحليل كبريتيد الهيدروجين المذاب في عينات النفط الخام ويتجلى ذلك باستخدام الكروماتوغرافيا الغازية. من أجل القضاء على التدخل بفعالية، يستخدم تكوين العمود الأبعاد، مع التحول عمداء تستخدم لنقل كبريتيد الهيدروجين من الأول إلى العمود الثاني (قطع القلب). يتم فصل العينات الخام السائلة أولا على عمود dimethylpolysiloxane، والغازات الخفيفة وكذلك فصل على عمود المستعبدين طبقة مسامية أنبوبي المفتوحة (مؤامرة) التي هي قادرة على فصل كبريتيد الهيدروجين من الأنواع الخفيفة الأخرى الكبريت قطع القلب. ثم يتم الكشف عن كبريتيد الهيدروجين مع كاشف التوهج الكبريت، إضافة طبقة إضافية من الانتقائية. بعد الانفصال والكشف عن كبريتيد الهيدروجين، وbackflushed النظام لإزالة المواد الهيدروكربونية العالية الغليان الموجودة في العينات الخام والحفاظ على سلامة الكروماتوغرافي. تم كميا المنحل كبريتيد الهيدروجين في عينات السائل 1،1 حتي 500 صمساء، مما يدل على تطبيق واسع لمجموعة من العينات. طريقة كما تم تطبيقها بنجاح لتحليل عينات الغاز من أكياس فراغ الرأس النفط الخام والغاز العملية، مع قياس من 0.7 إلى 9700 جزء في المليون كبريتيد الهيدروجين.

من أجل الحصول على تقدير موثوق من H 2 S لعينات كلا السائل والغاز والمعايرة المناسبة أمر ضروري. لحقن المعايرة وحقن عينة، وS الذروة H 2 يجب أن لا تكون متداخلة مع القمم المجاورة وينبغي أن يكون منطقة ذروة استنساخه. ويبين الشكل 3 حقنة لعينة الغاز حيث الغاز ?...

Watch this Scientific Journal Video about Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection at JoVE.com

Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

A multidimensional gas chromatography method for the analysis of dissolved hydrogen sulfide in liquid crude oil samples is presented. A Deans switch is used to heart-cut light sulfur gases for separation on a secondary column and detection on a sulfur chemiluminescence detector.

قياس H<sub&gt; 2</sub&gt; S في النفط الخام والنفط الخام فراغ الرأس عن طريق المتعددة الأبعاد الغاز اللوني، عمداء التبديل والكبريت انتقائية الكشف

A method for the analysis of dissolved hydrogen sulfide in crude oil samples is demonstrated using gas chromatography. In order to effectively eliminate ...

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Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

19.1K Views.  Natural Resources Canada. A multidimensional gas chromatography method for the analysis of dissolved hydrogen sulfide in liquid crude oil samples is presented. A Deans switch is used to heart-cut light sulfur gases for separation on a secondary column and detection on a sulfur chemiluminescence detector. 

Video: Measurement of H2S in Crude Oil and Crude Oil Headspace Using Multidimensional Gas Chromatography, Deans Switching and Sulfur-selective Detection

Optimize Flue Gas Settings to Promote Microalgae Growth in Photobioreactors via Computer Simulations

Flue gas from power plants can promote algal cultivation and reduce greenhouse gas emissions1. Microalgae not only capture solar energy more efficiently than plants3, but also synthesize advanced biofuels2-4. Generally, atmospheric CO2 is not a sufficient source for supporting maximal algal growth5. On the other hand, the high concentrations of CO2 in industrial exhaust gases have adverse effects on algal physiology. Consequently, both cultivation conditions (such as nutrients and light) and the control of the flue gas flow into the photo-bioreactors are important to develop an efficient &ldquo;flue gas to algae&rdquo; system. Researchers have proposed different photobioreactor configurations4,6 and cultivation strategies7,8 with flue gas. Here, we present a protocol that demonstrates how to use models to predict the microalgal growth in response to flue gas settings. We perform both experimental illustration and model simulations to determine the favorable conditions for algal growth with flue gas. We develop a Monod-based model coupled with mass transfer and light intensity equations to simulate the microalgal growth in a homogenous photo-bioreactor. The model simulation compares algal growth and flue gas consumptions under different flue-gas settings. The model illustrates: 1) how algal growth is influenced by different volumetric mass transfer coefficients of CO2; 2) how we can find optimal CO2 concentration for algal growth via the dynamic optimization approach (DOA); 3) how we can design a rectangular on-off flue gas pulse to promote algal biomass growth and to reduce the usage of flue gas. On the experimental side, we present a protocol for growing Chlorella under the flue gas (generated by natural gas combustion). The experimental results qualitatively validate the model predictions that the high frequency flue gas pulses can significantly improve algal cultivation.

Flue gas from power plants is a cheap CO2 source for algal growth. We have built prototype &#34;flue gas to algal cultivation&#34; systems and described how to scale up the algal cultivation process. We have demonstrated the use of a mass-transfer bio-reaction model to simulate and to design the optimal operation of flue gas for the growth of Chlorella sp. in algal photo-bioreactors.

تحسين إعدادات غاز المداخن في تعزيز نمو الطحالب في Photobioreactors عبر المحاكاة الحاسوبية

Flue gas from power plants can promote algal cultivation and reduce greenhouse gas emissions1. Microalgae not only capture solar energy more efficiently ...

Measurement of Greenhouse Gas Flux from Agricultural Soils Using Static Chambers

Measurement of greenhouse gas (GHG) fluxes between the soil and the atmosphere, in both managed and unmanaged ecosystems, is critical to understanding the biogeochemical drivers of climate change and to the development and evaluation of GHG mitigation strategies based on modulation of landscape management practices. The static chamber-based method described here is based on trapping gases emitted from the soil surface within a chamber and collecting samples from the chamber headspace at regular intervals for analysis by gas chromatography. Change in gas concentration over time is used to calculate flux. This method can be utilized to measure landscape-based flux of carbon dioxide, nitrous oxide, and methane, and to estimate differences between treatments or explore system dynamics over seasons or years. Infrastructure requirements are modest, but a comprehensive experimental design is essential. This method is easily deployed in the field, conforms to established guidelines, and produces data suitable to large-scale GHG emissions studies.

This article showcases the static chamber-based method for measurement of greenhouse gas flux from soil systems. With relatively modest infrastructure investments, measurements may be obtained from multiple treatments/locations and over timeframes ranging from hours to years.

قياس الجريان غازات الاحتباس الحراري من الأراضي الزراعية عن طريق الغرف ثابت

Measurement of greenhouse gas (GHG) fluxes between the soil and the atmosphere, in both managed and unmanaged ecosystems, is critical to understanding the ...

EPA Method 1615. Measurement of Enterovirus and Norovirus Occurrence in Water by Culture and RT-qPCR. Part III. Virus Detection by RT-qPCR

EPA Method 1615 measures enteroviruses and noroviruses present in environmental and drinking waters. This method was developed with the goal of having a standardized method for use in multiple analytical laboratories during monitoring period 3 of the Unregulated Contaminant Monitoring Rule. Herein we present the protocol for extraction of viral ribonucleic acid (RNA) from water sample concentrates and for quantitatively measuring enterovirus and norovirus concentrations using reverse transcription-quantitative PCR (RT-qPCR). Virus concentrations for the molecular assay are calculated in terms of genomic copies of viral RNA per liter based upon a standard curve. The method uses a number of quality controls to increase data quality and to reduce interlaboratory and intralaboratory variation. The method has been evaluated by examining virus recovery from ground and reagent grade waters seeded with poliovirus type 3 and murine norovirus as a surrogate for human noroviruses. Mean poliovirus recoveries were 20% in groundwaters and 44% in reagent grade water. Mean murine norovirus recoveries with the RT-qPCR assay were 30% in groundwaters and 4% in reagent grade water.

Here we present a procedure to quantify enterovirus and norovirus in environmental and drinking waters using reverse transcription-quantitative PCR. Mean virus recovery from groundwater with this standardized procedure from EPA Method 1615 was 20% for poliovirus and 30% for murine norovirus.

EPA الطريقة 1615. قياس الفيروسة المعوية ونوروفيروس التواجد في المياه عن طريق الثقافة وRT-QPCR. الجزء الثالث. كشف الفيروس عن طريق RT-QPCR

EPA Method 1615 measures enteroviruses and noroviruses present in environmental and drinking waters. This method was developed with the goal of having a ...

Chemical Analysis of Water-accommodated Fractions of Crude Oil Spills Using TIMS-FT-ICR MS

Multiple chemical processes control how crude oil is incorporated into seawater and also the chemical reactions that occur overtime. Studying this system requires the careful preparation of the sample in order to accurately replicate the natural formation of the water-accommodated fraction that occurs in nature. Low-energy water-accommodated fractions (LEWAF) are carefully prepared by mixing crude oil and water at a set ratio. Aspirator bottles are then irradiated, and at set time points, the water is sampled and extracted using standard techniques. A second challenge is the representative characterization of the sample, which must take into consideration the chemical changes that occur over time. A targeted analysis of the aromatic fraction of the LEWAF can be performed using an atmospheric-pressure laser ionization source coupled to a custom-built trapped ion mobility spectrometry&#8211;Fourier transform&#8211;ion cyclotron resonance mass spectrometer (TIMS-FT-ICR MS). The TIMS-FT-ICR MS analysis provides high-resolution ion mobility and ultrahigh-resolution MS analysis, which further allow the identification of isomeric components by their collision cross-sections (CCS) and chemical formula. Results show that as the oil-water mixture is exposed to light, there is significant photo-solubilization of the surface oil into the water. Over time, the chemical transformation of the solubilized molecules takes place, with a decrease in the number of identifications of nitrogen- and sulfur-bearing species in favor of those with a greater oxygen content than were typically observed in the base oil.

The low-energy water-accommodated fraction (LEWAF) of crude oil is a challenging system to analyze, because over time, this complex mixture undergoes chemical transformations. This protocol illustrates methods for the preparation of the LEWAF sample and for performing photo-irradiation and chemical analysis by trapped ion mobility spectrometry&#8211;FT-ICR MS.

التحليل الكيميائي للالكسور-استيعاب المياه من النفط الخام التسربات عن طريق TIMS-FT-ICR MS

Multiple chemical processes control how crude oil is incorporated into seawater and also the chemical reactions that occur overtime. Studying this system ...

Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions

A rheometer system to measure the rheology of crude oil in equilibrium with carbon dioxide (CO2) at high temperatures and pressures is described. The system comprises a high-pressure rheometer which is connected to a circulation loop. The rheometer has a rotational flow-through measurement cell with two alternative geometries: coaxial cylinder and double gap. The circulation loop contains a mixer, to bring the crude oil sample into equilibrium with CO2, and a gear pump that transports the mixture from the mixer to the rheometer and recycles it back to the mixer. The CO2 and crude oil are brought to equilibrium by stirring and circulation and the rheology of the saturated mixture is measured by the rheometer. The system is used to measure the rheological properties of Zuata crude oil (and its toluene dilution) in equilibrium with CO2 at elevated pressures up to 220 bar and a temperature of 50 &#176;C. The results show that CO2 addition changes the oil rheology significantly, initially reducing the viscosity as the CO2 pressure is increased and then increasing the viscosity above a threshold pressure. The non-Newtonian response of the crude is also seen to change with the addition of CO2.

Measurement of the Rheology of Crude Oil in Equilibrium with CO2 at Reservoir Conditions

A method for measuring the rheology of crude oil in equilibrium with carbon dioxide at reservoir conditions is presented.

قياس ريولوجيا النفط الخام في التوازن مع كو<sub&gt; 2</sub&gt; في ظروف الخزان

A rheometer system to measure the rheology of crude oil in equilibrium with carbon dioxide (CO2) at high temperatures and pressures is described. The ...

Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

Microfluidic devices are versatile tools for studying transport processes at a microscopic scale. A demand exists for microfluidic devices that are resistant to low molecular-weight oil components, unlike traditional polydimethylsiloxane (PDMS) devices. Here, we demonstrate a facile method for making a device with this property, and we use the product of this protocol for examining the pore-scale mechanisms by which foam recovers crude oil. A pattern is first designed using computer-aided design (CAD) software and printed on a transparency with a high-resolution printer. This pattern is then transferred to a photoresist via a lithography procedure. PDMS is cast on the pattern, cured in an oven, and removed to obtain a mold. A thiol-ene crosslinking polymer, commonly used as an optical adhesive (OA), is then poured onto the mold and cured under UV light. The PDMS mold is peeled away from the optical adhesive cast. A glass substrate is then prepared, and the two halves of the device are bonded together. Optical adhesive-based devices are more robust than traditional PDMS microfluidic devices. The epoxy structure is resistant to swelling by many organic solvents, which opens new possibilities for experiments involving light organic liquids. Additionally, the surface wettability behavior of these devices is more stable than that of PDMS. The construction of optical adhesive microfluidic devices is simple, yet requires incrementally more effort than the making of PDMS-based devices. Also, though optical adhesive devices are stable in organic liquids, they may exhibit reduced bond-strength after a long time. Optical adhesive microfluidic devices can be made in geometries that act as 2-D micromodels for porous media. These devices are applied in the study of oil displacement to improve our understanding of the pore-scale mechanisms involved in enhanced oil recovery and aquifer remediation.

The goal of this procedure is to easily and rapidly produce a microfluidic device with customizable geometry and resistance to swelling by organic fluids for oil recovery studies. A polydimethylsiloxane mold is first generated, and then used to cast the epoxy-based device. A representative displacement study is reported.

أجهزة موائع جزيئية لوصف العمليات المسام على نطاق الحدث في وسائل الإعلام المسامية لطلبات استرداد النفط

Microfluidic devices are versatile tools for studying transport processes at a microscopic scale. A demand exists for microfluidic devices that are ...

The Effect of the Application of Thyme Essential Oil on Microbial Load During Meat Drying

Meat is a high protein meal that is used in the preparation of jerky, a popular food snack, where preservation and safety are important. To assure food safety and to extend the shelf life of meat and meat products, the use of either synthetic or natural preservatives have been applied to control and eliminate foodborne bacteria. A growing interest in the application of natural food additives for meat has increased. Microorganisms, such as Escherichia coli, contaminate meat and meat products, causing foodborne illnesses. Therefore, it is necessary to improve the meat conservation process. However, the use of essential oils when the meat is being dried has not been deeply studied. In this regard, there is an opportunity to increase the value of dried meat and reduce the risk of foodborne illnesses by applying essential oils during the drying process. In this protocol, we present a novel method of applying thyme essential oil (TEO) during meat drying, specifically in vapor form directly in a drying chamber. For evaluation, we use Minimal Inhibitory Concentration (MIC) to detect the number of harmful bacteria in the treated samples compared to raw samples. The preliminary results show that this method is a viable and alternative option to synthetic preservatives and that it significantly reduces microbial load in dried meat.

Microorganisms such as Escherichia coli that contaminate meat products cause foodborne illnesses. The use of essential oils in the meat drying process has not been deeply studied. Here, we present a novel method of applying thyme essential oil to meat during drying to reduce the microbial load in dried meat.

أثر تطبيق النفط الزعتر على الحمولة الميكروبية أثناء تجفيف اللحوم

Meat is a high protein meal that is used in the preparation of jerky, a popular food snack, where preservation and safety are important. To assure food ...

Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale

The amount of adsorbed shale gas is a key parameter used in shale gas resource evaluation and target area selection, and it is also an important standard for evaluating the mining value of shale gas. Currently, studies on the correlation between particle size and methane adsorption are controversial. In this study, an isothermal adsorption apparatus, the gravimetric sorption analyzer, is used to test the adsorption capacity of different particle sizes in shale to determine the relationship between the particle size and the adsorption capacity of shale. Thegravimetric method requires fewer parameters and produces better results in terms of accuracy and consistency than methods like the volumetric method. Gravimetric measurements are performed in four steps: a blank measurement, preprocessing, a buoyancy measurement, and adsorption and desorption measurements. Gravimetric measurement is presently considered to be a more scientific and accurate method of measuring the amount of adsorption; however, it is time-consuming and requires a strict measuring technique. A Magnetic Suspension Balance (MSB) is the key to verify the accuracy and consistency of this method. Our results show that adsorption capacity and particle size are correlated, but not a linear correlation, and the adsorptions in particles sieved into 40 - 60 and 60 - 80 meshes tend to be larger. We propose that the maximum adsorption corresponding to the particle size is approximately 250 &#181;m (60 mesh) in the shale gas fracturing.

We use an isothermal adsorption apparatus, the gravimetric sorption analyzer, to test the adsorption capacity of different particle sizes of shale, in order to find out the relationship between particle size and the adsorption capacity of shale.

دراسة تجريبية للعلاقة بين حجم الجسيمات، والقدرة على امتصاص غاز الميثان في الصخري

The amount of adsorbed shale gas is a key parameter used in shale gas resource evaluation and target area selection, and it is also an important standard ...

Detection of Viruses from Bioaerosols Using Anion Exchange Resin

This protocol demonstrates a customized bioaerosol sampling method for viruses. In this system, anion exchange resin is coupled with liquid impingement-based air sampling devices for efficacious concentration of negatively-charged viruses from bioaerosols. Thus, the resin serves as an additional concentration step in the bioaerosol sampling workflow. Nucleic acid extraction of the viral particles is then performed directly from the anion exchange resin, with the resulting sample suitable for molecular analyses. Further, this protocol describes a custom-built bioaerosol chamber capable of generating virus-laden bioaerosols under a variety of environmental conditions and allowing for continuous monitoring of environmental variables such as temperature, humidity, wind speed, and aerosol mass concentration. The main advantage of using this protocol is increased sensitivity of viral detection, as assessed via direct comparison to an unmodified conventional liquid impinger. Other advantages include the potential to concentrate diverse negatively-charged viruses, the low cost of anion exchange resin (~$0.14 per sample), and ease of use. Disadvantages include the inability of this protocol to assess infectivity of resin-adsorbed viral particles, and potentially the need for the optimization of the liquid sampling buffer used within the impinger.

An anion exchange resin-based method, adapted to liquid impingement-based bioaerosol sampling of viruses is demonstrated. When coupled with downstream molecular detection, the method allows for facile and sensitive detection of viruses from bioaerosols.

الكشف عن الفيروسات من بيوايروسولس استخدام الراتنجات التبادل شاردة

This protocol demonstrates a customized bioaerosol sampling method for viruses. In this system, anion exchange resin is coupled with liquid ...

Quantifying Plant Soluble Protein and Digestible Carbohydrate Content, Using Corn (Zea mays) As an Exemplar

Elemental data are commonly used to infer plant quality as a resource to herbivores. However, the ubiquity of carbon in biomolecules, the presence of nitrogen-containing plant defensive compounds, and variation in species-specific correlations between nitrogen and plant protein content all limit the accuracy of these inferences. Additionally, research focused on plant and/or herbivore physiology require a level of accuracy that is not achieved using generalized correlations. The methods presented here offer researchers a clear and rapid protocol for directly measuring plant soluble proteins and digestible carbohydrates, the two plant macronutrients most closely tied to animal physiological performance. The protocols combine well characterized colorimetric assays with optimized plant-specific digestion steps to provide precise and reproducible results. Our analyses of different sweet corn tissues show that these assays have the sensitivity to detect variation in plant soluble protein and digestible carbohydrate content across multiple spatial scales. These include between-plant differences across growing regions and plant species or varieties, as well as within-plant differences in tissue type and even positional differences within the same tissue. Combining soluble protein and digestible carbohydrate content with elemental data also has the potential to provide new opportunities in plant biology to connect plant mineral nutrition with plant physiological processes. These analyses also help generate the soluble protein and digestible carbohydrate data needed to study nutritional ecology, plant-herbivore interactions and food-web dynamics, which will in turn enhance physiology and ecological research.

Quantifying Plant Soluble Protein and Digestible Carbohydrate Content, Using Corn Zea mays As an Exemplar

The protocols described herein provide a clear and approachable methodology for measuring soluble protein and digestible (non-structural) carbohydrate content in plant tissues. The ability to quantify these two plant macronutrients has significant implications for advancing the fields of plant physiology, nutritional ecology, plant-herbivore interactions and food-web ecology.

التحديد الكمي لمصنع البروتين للذوبان والهضم الكربوهيدرات المحتوى، استخدام الذرة (ميس زيا) كأنموذج

Elemental data are commonly used to infer plant quality as a resource to herbivores. However, the ubiquity of carbon in biomolecules, the presence of ...

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