scholarly journals On the Structural Analysis ofγ-Ray Induced Primary Free Radicals in UHMWPE and Vitamin E Stabilized UHMWPE by ESR Spectroscopy

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Malik Sajjad Mehmood ◽  
Muhammad Shah Jahan ◽  
Tariq Yasin ◽  
Muhammad Tariq ◽  
Mohammad Ahmad Choudhry ◽  
...  
Keyword(s):  
Vitamin E ◽  
Room Temperature ◽  
Oriented Molecules ◽  
Powder Samples ◽  
One Year ◽  
Gamma Irradiated ◽  
Subsequent Storage ◽  
And Storage ◽  
Best Fit ◽  
Radical Signal

Oriented allyl radicals are detected at room temperature in gamma irradiated UHMWPE. The effects of vitamin E and storage at room temperature on this oriented structure are also investigated during the study. While testing powder as well as compression-molded solids, with or without vitamin E, a typical ESR spectrum was recorded at room temperature following 100 kGy gamma dose and subsequent storage at −78.5°C for one year. The simulated results show that the relative abundance of 5% alkyl, 68% allyl, and 27% polyenyl produced a 98.7% best fit of experimental ones. Furthermore, the allyl radical signal gives approximately 20% of random orientations and 80% of oriented molecules. In oriented PE, measured at −196°C, Ohnishi et al. (1916) observed 25 lines within a total magnetic field width of approximately 133 G. Our spectra also show 25 lines spread over 136 G in UHMWPE powder samples and at room temperature after one year of storage.

Bacterial growth in seafood on restaurant premises

1975 ◽  
Vol 21 (11) ◽  
pp. 1788-1797 ◽  
Author(s):  
Nirmala Venkataramaiah ◽  
A. G. Kempton
Keyword(s):  
Bacterial Growth ◽  
Room Temperature ◽  
Quality Loss ◽  
Sensitive Measure ◽  
Keeping Quality ◽  
A Chain ◽  
Subsequent Storage ◽  
And Storage ◽  
Improved Methods ◽  
The Way

Operational guidelines for a chain of the newer type of seafood restaurants and take-out stores were derived from plots of bacteriological and trimethylamine changes during the preparation and storage of cod fillets, shrimp, and clams. If fish is to be defrosted at room temperature it should be washed and portioned within 14 h. Subsequent storage at 5 °C should not exceed 72 h and once removed from the refrigerator it should be fried within 3 h. New stores should consider improved methods of defrosting. Trimethylamine content was a more sensitive measure of quality loss than bacterial growth. Shrimp quality can be improved by emphasizing the way shells are removed because most of the contamination was external. Shrimp shelled while still frozen had the best potential keeping quality. Clam meat is handled less and is always held at 5 °C; but bacterial growth indicated that it should not be held on the premises for more than 3 days including the time necessary for defrosting. Batter prepared fresh daily can be left at room temperature. Frying can obliterate poor handling procedures, but adequate cooking is essential under any conditions. Clams are a gourmet item but the practice of cooking them lightly at customer request proved inadvisable.

Investigations on the Nature of Hemophilia A

1963 ◽  
Vol 09 (01) ◽  
pp. 030-052 ◽  
Author(s):  
Eberhard Mammen
Keyword(s):  
Factor Viii ◽  
Human Plasma ◽  
Barium Sulfate ◽  
Freeze Drying ◽  
Room Temperature ◽  
Hemophilia A ◽  
Normal Human Plasma ◽  
Normal Human ◽  
And Storage ◽  
Prothrombin Activation

SummaryIn this paper an inhibitor is described that is found in hemophilic plasma and serum different from any till now described inhibitor. The inhibitor only inhibits prothrombin activation in the “intrinsic clotting systems”. This inhibitor is probably not present in normal human plasma or serum. It is destroyed by ether and freeze drying, is labile to acid and storage at room temperature. It is stable upon dialysis and has not been adsorbed on barium sulfate, aluminum hydroxide or kaolin. It precipitates at 50% v/v saturation with alcohol. The nature of this inhibitor seems to be a protein or lipoprotein.Factor VIII was isolated from hemophilic plasma. The amount isolated was the same as from normal plasma and the activity properties were not different. Hemophiliacs have normal amounts of factor VIII.

scholarly journals Bottom-Up Generation of Peak Demand Scenarios in Water Distribution Networks

2020 ◽  
Vol 13 (1) ◽  
pp. 31
Author(s):  
Enrico Creaco ◽  
Giacomo Galuppini ◽  
Alberto Campisano ◽  
Marco Franchini
Keyword(s):  
Water Distribution ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Peak Demand ◽  
Long Time ◽  
Cross Correlations ◽  
User Demand ◽  
One Year ◽  
The One ◽  
Best Fit

This paper presents a two-step methodology for the stochastic generation of snapshot peak demand scenarios in water distribution networks (WDNs), each of which is based on a single combination of demand values at WDN nodes. The methodology describes the hourly demand at both nodal and WDN scales through a beta probabilistic model, which is flexible enough to suit both small and large demand aggregations in terms of mean, standard deviation, and skewness. The first step of the methodology enables generating separately the peak demand samples at WDN nodes. Then, in the second step, the nodal demand samples are consistently reordered to build snapshot demand scenarios for the WDN, while respecting the rank cross-correlations at lag 0. The applications concerned the one-year long dataset of about 1000 user demand values from the district of Soccavo, Naples (Italy). Best-fit scaling equations were constructed to express the main statistics of peak demand as a function of the average demand value on a long-time horizon, i.e., one year. The results of applications to four case studies proved the methodology effective and robust for various numbers and sizes of users.

scholarly journals Evaluation of Microbial Culture Techniques for the Isolation of Pythium Insidiosum from Equine Tissues

2002 ◽  
Vol 14 (4) ◽  
pp. 288-294 ◽  
Author(s):  
Amy M. Grooters ◽  
Amy Whittington ◽  
Mae K. Lopez ◽  
Michelle N. Boroughs ◽  
Alma F. Roy
Keyword(s):  
Room Temperature ◽  
Microbial Culture ◽  
Sample Type ◽  
Pythium Insidiosum ◽  
Selective Media ◽  
Culture Techniques ◽  
Media Type ◽  
Antibiotic Solution ◽  
And Storage ◽  
Storage Technique

The purpose of this study was to evaluate the effects of sample handling, storage, and culture techniques on the isolation of Pythium insidiosum from infected equine tissues. Tissue and kunker samples obtained immediately posteuthanasia from a horse with subcutaneous pythiosis were used to assess the effects of sample type (kunkers vs. tissues), media type (selective vs. nonselective), storage technique, and storage time on P. insidiosum isolation rate. Overall, isolation rates were higher from fresh kunkers (94.6%) and stored kunkers (76.4%) than from fresh tissues (8.3%) or stored tissues (4.6%). Isolation of P. insidiosum also occurred more often on antibiotic-containing media than on nonselective media for both fresh and stored samples. For samples that were stored for 1–3 days prior to culture, P. insidiosum isolation rates were highest for the following techniques: kunkers stored at room temperature and plated on selective media (100%), kunkers stored at 4 C and then plated on either nonselective (91.7%) or selective (95.8%) media, kunkers stored on cold packs and then plated on either nonselective (93.8%) or selective (100%) media, kunkers stored in ampicillin solution and plated on selective media (100%), and kunkers stored in ampicillin/gentocin solution and plated on selective media (87.5%). For samples stored for 4–5 days, P. insidiosum isolation rates were highest for kunkers stored at 4 C and then plated on either nonselective (81.3%) or selective (87.5%) media, kunkers stored in ampicillin solution and then plated on selective media (87.5%), and kunkers stored in ampicillin/gentocin solution and plated on selective media (87.5%). Results of this study suggest that optimal isolation rates of P. insidiosum from infected equine tissues are achieved by culturing fresh kunkers on selective media. For samples that cannot be processed immediately, acceptable handling techniques include storage at room temperature for up to 3 days, refrigeration for up to 5 days, shipping on cold packs, and storage in antibiotic solution, each combined with subsequent inoculation on selective media.

DEVELOPMENT OF CITRUS BASED BEVERAGE UTILIZING BACOPA MONNIERI

2021 ◽  
pp. 18-19
Author(s):  
Twamoghna De ◽  
Purushottam Kumar ◽  
Jayati Pal
Keyword(s):  
Sensory Evaluation ◽  
Room Temperature ◽  
Control Sample ◽  
Leaf Extracts ◽  
Nutritional Values ◽  
Soda Water ◽  
Three Samples ◽  
Microbial Analysis ◽  
And Storage

The study was done to formulate a drink from an old medicinal herb and retain all the potential benets with a new taste and avor. For this an herbal drink was formulated and its quality ascertained. In the rst part of the study, syrup was prepared from the raw leaves of the herb with addition of acids and avors. Then this syrup was diluted further followed by carbonation with 1:3 ratio of soda water and bottled. Three samples were prepared namely, T1 (same as previous but with 1:3 ratio carbonation and dividing the sample hot lled and cold lled ). In the next part, prepared samples were subjected to sensory evaluation,chemical and microbial analysis when fresh and 0 after regular intervals at room temperature (27±1 °C) and refrigerated temperature (below 7 C). Microbial analysis of the product was done to check the quality of the herbal drink and self-life of the product. The control sample T1 cold lled was the most acceptable due to its unique taste and avor, followed by sample T1( hot lled) . The present study entailed to conclude that preparation of a drink with B. monnieri leaf extracts gives a new taste and avor with high nutritional values. This drink can be stored safe for nearly a month if carbonated and storage at refrigerated 0 temperature (below 5 C).

scholarly journals Evaluation of pyrite and pyrrhotite in concretes

2016 ◽  
Vol 9 (3) ◽  
pp. 484-493 ◽  
Author(s):  
A. P. Marcelino ◽  
J. M. Calixto ◽  
A. G. Gumieri ◽  
M. C. Ferreira ◽  
C. L. Caldeira ◽  
...  
Keyword(s):  
Room Temperature ◽  
Iron Sulfide ◽  
Hydroelectric Power Plant ◽  
Hydroelectric Power ◽  
Rock Samples ◽  
Limit Value ◽  
Plant Area ◽  
Different Temperatures ◽  
Pyrite Content ◽  
One Year

ABSTRACT It is well known that aggregate characteristics can intensively interfere in concrete behavior especially when sulfides are presented in the aggregates. The lack of consensus to content limit value of these deleterious sulfur compounds in concrete structures for dams has motivated several investigations worldwide. Within this scenario, this work presents a methodology to evaluate the presence of pyrite and pyrrhotite in concretes produced with aggregates containing sulfides. For the study, rock samples from the Irapé hydroelectric power plant area in Minas Gerais (Brazil) were used. This plant was built in a geological site where the rock presented sulfide levels of at least 3%. These rock samples were first ground and then used as aggregates in mortars, which were, during almost one year, subjected to three different exposed conditions: temperature of 23° ± 2°C and relative humidity of 95 to 100%; calcium hydroxide solution diluted in water kept at two different temperatures: room temperature and 50° C. The presence and amount of pyrrhotite were obtained from a leaching process of the material (aggregate or mortar) in a solution of hydrochloric acid. This procedure allowed also the evaluation of the pyrite content. The results showed that the amount of pyrite has remained virtually constant over time in the three exposure situations. This finding indicates that sulfur limits in aggregates should be set according to the type of iron sulfide presented and not solely by the total amount of sulfur.

STRUCTURE AND MAGNETIC PROPERTIES OF MECHANICAL ALLOYED Mn-15at.%Al

2013 ◽  
Vol 12 (01) ◽  
pp. 1350006
Author(s):  
AHMED E. HANNORA ◽  
FARIED F. HANNA ◽  
LOTFY K. MAREI
Keyword(s):  
Thermal Analysis ◽  
Room Temperature ◽  
Average Crystallite Size ◽  
Al Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Milled Sample ◽  
Powder Samples ◽  
Xrd Patterns ◽  
Method Analysis

Mechanical alloying (MA) method has been used to produce nanocrystallite Mn -15at.% Al alloy. X-ray diffraction (XRD) patterns for the as-milled elemental α- Mn and aluminum powder samples show a mixture of α + β- MnAl phases after 20 h of milling and changes to a dominant β- MnAl phase structure after 50 h. An average crystallite size of 40 nm was determined from Hall–Williamson method analysis after 5 h of milling. Moreover, the thermal analysis results using differential thermal analysis (DTA), suggested a possible phase transformation after 20 h of milling. Isothermal treatments are carried in the temperature range of 450°C to 1000°C. Room-temperature vibrating sample magnetometer (VSM) measurements of the hysteretic response revealed that the saturation magnetization Bs and coercivity Hc for 10 h ball milled sample are ~ 2.1 emu/g and ~ 92 Oe, respectively.

scholarly journals Oxidative stability of tilapia feeds containing Saccharomyces cerevisiae and Spirulina platensis

2020 ◽  
Vol 50 (1) ◽  
Author(s):  
Thiago Luís Magnani Grassi ◽  
Juliana Sedlacek-Bassani ◽  
Elisa Helena Giglio Ponsano
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Vitamin E ◽  
Spirulina Platensis ◽  
Nile Tilapia ◽  
Room Temperature ◽  
Control Diet ◽  
Thiobarbituric Acid ◽  
Thiobarbituric Acid Reactive Substances ◽  
Oxidative Rancidity ◽  
Plastic Bags

ABSTRACT: The aim of this study was to evaluate the effect of the inclusion of microbial biomass on the oxidative rancidity of tilapia rations stored for 12 months. Treatments included a control diet and diets supplemented with either 0.01% vitamin E, 0.25 and 0.5% of Saccharomyces cerevisiae and 0.25 and 0.5% of Spirulina platensis. Experimental diets were stored in the dark inside plastic bags at room temperature (25 °C) for 12 months. The oxidative rancidity was measured as thiobarbituric acid reactive substances (TBARS). It was concluded that the inclusions of Spirulina platensis at 0.25% (1.734 ± 0.206) and 0.5% (1.629 ± 0.181) and Saccharomyces cerevisiae at 0.5% (1.459 ± 0.305) minimized the oxidative rancidity in comparation to control diet (2.843 ± 0.109) of Nile tilapia until 12 months of storage.

scholarly journals Dabai Fruit: Postharvest Handling and Storage

2020 ◽  
Author(s):  
Siti Hajar Ariffin ◽  
Rosnah Shamsudin ◽  
I. S. M. A. Tawakkal
Keyword(s):  
Shelf Life ◽  
Room Temperature ◽  
Quality Loss ◽  
Potential Development ◽  
Postharvest Handling ◽  
Canarium Odontophyllum ◽  
Handling Quality ◽  
And Storage ◽  
Wide Potential ◽  
Quality And Shelf Life

Dabai (Canarium odontophyllum) or also known as ‘Sarawak olive’ is one of the potential indigenous seasonal fruits commonly found in Sarawak. Due to its high nutritional contents, it has wide potential to be marketed locally and exported internationally. Dabai is very delicate and highly perishable. The shelf life of dabai is usually 3 days when stored in room temperature (27°C). Improper storage and handling lead to the reduction of quality and shelf life of the fruit throughout storage. There is still limitation on the information of postharvest, storage and handling, quality and shelf life of dabai. Studies on quality and shelf life affected by storage treatment and packaging are necessary in optimising shelf life and minimising quality loss of the fruit. This could ensure further potential development of the fruit locally and internationally.

scholarly journals Stability of pseudorabies virus during freeze-drying and storage: effect of suspending media

1976 ◽  
Vol 4 (1) ◽  
pp. 1-5
Author(s):  
E M Scott ◽  
W Woodside
Keyword(s):  
Freeze Drying ◽  
Pseudorabies Virus ◽  
Storage Effect ◽  
Drying Process ◽  
Sodium Glutamate ◽  
Degree Of Protection ◽  
The Stability ◽  
Subsequent Storage ◽  
And Storage ◽  
Lactalbumin Hydrolysate

The effect of suspending media on the stability of pseudorabies virus upon freeze-drying and subsequent storage was studied. A variety of media was tested, including: sodium glutamate; sucrose; lactose; lactalbumin hydrolysate; peptone; a combination of sucrose, dextran, and glutamate; and various combinations of sucrose, glutamate, and potassium phosphates. Suspending media containing glutamate, either alone or in combination with sucrose and either dextran or phosphates, afforded the greatest degree of protection during the freeze-drying process and upon storage. Some possible functions of these additives in preventing injury to the virus during freezing and drying have been suggested.

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