article{6543017c-6a84-44b2-a897-83c36d0dfe34, abstract = {A negative shift in the calcium isotopic,br/,composition of marine carbonate rocks,br/,spanning the end-Permian extinction horizon,br/,in South China has been used to argue,br/,for an ocean acidification event coincident,br/,with mass extinction. This interpretation,br/,has proven controversial, both because the,br/,excursion has not been demonstrated across,br/,multiple, widely separated localities, and because,br/,modeling results of coupled carbon and,br/,calcium isotope records illustrate that calcium,br/,cycle imbalances alone cannot account,br/,for the full magnitude of the isotope excursion.,br/,Here, we further test potential controls,br/,on the Permian-Triassic calcium isotope,br/,record by measuring calcium isotope ratios,br/,from shallow-marine carbonate successions,br/,spanning the Permian-Triassic boundary in,br/,Turkey, Italy, and Oman. All measured sections,br/,display negative shifts in δ44/40Ca of up,br/,to 0.6‰. ...

Brachiopod shells are widely used as an archive to reconstruct elemental and isotopic composition of seawater. Studies, focused on oxygen and carbon isotopes over the last decades, are increasingly extending to the emerging calcium isotope system. To date, only little attention has been paid to test the reliability of fossil brachiopods on their modern counterparts. In this context, the present study investigates two modern brachiopods, Terebratulina septentrionalis (eastern Canada, 5-30 m depth, 7.1 °C seasonal temperature variation, two-layer shell) and Gryphus vitreus (northern Mediterranean, 200 m depth, constant all-year round temperature, three-layer shell). Both species were sampled along the ontogenetic growth direction and calcium, oxygen, and carbon isotopes as well as elemental concentration were measured. Calcium isotopes were analyzed on TIMS. The elemental composition was analyzed by LA-ICP-MS and ICP-AES. The results indicate an intra-specimen δ44/40Ca variation ranging from ...

Researchers have come one step closer to understanding unstable atomic nuclei. The protons and neutrons inside the atomic nucleus exhibit shell structures in a manner similar to electrons in an atom.

Multiple lines of evidence have shown that the isotopic composition and concentration of calcium in seawater have changed over the past 28 million years. A high-resolution, continuous seawater calcium isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the seawater calcium isotopic ratio suggesting changes in seawater calcium concentrations. The most pronounced increase in the ??44/40Ca value of seawater (of 0.3 per mil) occurred over roughly 4 million years following a period of low values around 13 million years ago. The major change in marine calcium corresponds to a climatic transition and global change in the carbon cycle and suggests a reorganization of the global biogeochemical system....

Abstract: Large wavelength shifts of infrared triplet lines of Ca ii have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including 48 Ca. One member of the triplet, Λ8542, had been either unavailable, or of poor quality in earlier spectra. The present material shows conclusively that the stellar Λ8542 shifts are consistent with an interpretation in terms of 48 Ca. We find no relation between isotopic shifts of the Ca ii triplet lines, and those of Hg iiΛ3984. There is a marginal indication that the shifts are anticorrelated with the surface field strengths of the magnetic stars. We see sparse evidence for 48 Ca in other chemically peculiar stars, for example, Am stars, metal-poor stars or chemically peculiar red giants. However, the sample is still very small, and the wavelengths of all three triplet lines, including those in the Sun, show slight positive shifts with respect to terrestrial positions. Some profiles of the Ca ...

Of 26 screened patients, 17 were included. The median age was 44 (range 20-75) years. The median time interval between baseline and first follow-up was 13 (6-27) weeks. Compared to baseline, an 81% decrease was observed for median total testosterone (to 3.4 nmol/L (0.4-12.2); P , 0.0001) and free testosterone (to 0.06 nmol/L (0.01-0.18); P , 0.0001). Median total estradiol decreased by 71% (to 17.6 pmol/L (4.7-35.6); P , 0.0001). Increased serum calcium (P , 0.0001) and phosphate (P = 0.0016) was observed, paralleled by decreased PTH (P = 0.0156) and 1,25-dihydroxyvitamin D3 (P = 0.0134). The stable calcium isotope ratio (δ44/42Ca) decreased (P = 0.0458), indicating net calcium loss from bone. Bone-specific alkaline phosphatase and osteocalcin decreased (P , 0.0001 and P = 0.0056, respectively), periostin tended to decrease (P = 0.0500), whereas sclerostin increased (P , 0.0001), indicating suppressed bone formation. Serum bone resorption markers (TRAP, CTX) were unaltered. ...

Darmstadt, September 5, 2018. Physicists at the TU Darmstadt and their collaboration partners have performed laser spectroscopy on cadmium isotopes to confirm an improved model of the atomic nucleus. It has been developed to describe the exceptional behaviour of the radii of calcium isotopes. The results published in Physical Review Letters could be a step towards a global model of the nuclear structure. The charge radius, which is the spatial expansion of the positive nuclear charge, is one of the fundamental parameters of an atomic nucleus, and leaves its traces in the optical spectrum of an atom even though this is created by the electrons in the atomic shell. The spectrum of every type of atom is as unique as a fingerprint, and can be measured precisely using laser light. This provides information on the size and properties of the atomic nucleus. The technique is also suitable for very short-lived nuclei which decay within a blink of an eye. Laser spectroscopy measurements on a long chain ...

mothra, extra knight, please! All this acrimony puzzles me, because, as I said earlier, I really am on your side here, and I am trying to help. And I am not calling you names, am I? Thats a waste of time…and we may not have much time to waste.. I actually think, if we can get past the rhetoric, that we are on the same page here. There is a lot we can agree on I think:. 1. Radiation causes biological harm, and for a given tissue type, the level of that harm is as far as we know proportional to the total amount of radiation energy absorbed by that tissue over time. 2. There is a lot of radioactive material coming from Fukushima, on par with Chernobyl, and maybe for a long time to come, or if the worst happens, in another explosive event. So far, though, a great deal of the release has been into the ocean, though there are continuing releases into the atmosphere. We are being kept in the dark by the Japanese authorities both deliberately and by ineptitude. We need to mount a stronger campaign of ...

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In a crossover, single blind, randomized trial the calcium bioavailability of two calcium supplements will be compared.That is AlgaeCal®(Algaecal Inc, Vancouver, Canada)(1 dose is 3 capsules of 180 mg calcium), derived from ocean algae and the proprietary calcium supplement Caltrate 600® (Wyeth Consumer Healthcare, Inc).. After a screening visits 20 healthy male subjects aged 20-50 years will spend a day at the research center to examine calcium bioavailability data. They will be randomized to consume either first the AlgaeCal® supplement or the Caltrate 600® supplement. After a one week wash-out period subjects will be supplemented with the other supplement. During the examination day blood and urine samples will be collected before and until eight hours after the supplementation for analyses of calcium, creatinine, phosphorus, albumin and 25 Hydroxy vitamin D. Subjects are instructed to avoid taking calcium and/or vitamin D supplements 1 week before and during the entire study period. In ...

TY - JOUR. T1 - The effect of vitamin D on calcium absorption in older women. AU - Gallagher, J. Christopher. AU - Yalamanchili, Vinod. AU - Smith, Lynette M.. PY - 2013/4/1. Y1 - 2013/4/1. UR - http://www.scopus.com/inward/record.url?scp=84878071037&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=84878071037&partnerID=8YFLogxK. U2 - 10.1097/01.ogx.0000429299.32340.7c. DO - 10.1097/01.ogx.0000429299.32340.7c. M3 - Comment/debate. AN - SCOPUS:84878071037. VL - 68. SP - 287. EP - 289. JO - Obstetrical and Gynecological Survey. JF - Obstetrical and Gynecological Survey. SN - 0029-7828. IS - 4. ER - ...

This study will enroll at least 60 pregnant women in a randomized cross-over study in Dhaka, Bangladesh. Each participant will be randomized to one of 3 calcium doses: 500 mg, 1000 mg, 1500 mg elemental Ca per day. Each participant will undergo two calcium absorption tests, one with a micronutrient supplement powder containing non-encapsulated (non-coated) calcium and the other with a micronutrient supplement powder containing encapsulated calcium at the same dose. The absorption tests will be separated by a 2-week washout period. Fractional calcium absorption will be measured using the dual stable isotope method. For each test, the formulation will be administered orally for 9 days; on the 10th day, a 44Ca- labeled stable isotope will be given orally and a 42Ca-labeled stable isotope dose will be given intravenously. Urine will be collected for 48 hours to measure calcium absorption ...

TY - JOUR. T1 - Secretion and excretion of calcium by the human gastrointestinal tract. AU - Heaney, Robert P.. AU - Skillman, Thomas G.. PY - 1964/7/1. Y1 - 1964/7/1. N2 - Fecal excretion of calcium of endogenous origin has been measured in 52 studies in 33 adult human subjects, under full metabolic balance conditions. Endogenous fecal calcium averaged .130 ± .047 Gm. per day, was positively correlated with both fecal calcium and dietary calcium and was inversely correlated with fractional calcium absorption. The regression line relating endogenous fecal calcium with fractional absorption allowed estimates for total intestinal calcium secretion at both zero and 100 per cent absorption; from these estimates it was calculated that approximately 15 per cent of the total intestinal calcium secretion was nonabsorbable even under conditions when dietary calcium was completely absorbed (presumably because it enters the gut caudad of the absorption sites). Total intestinal calcium secretion, ...

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Corn Tortillas Taco Shells. A Mexican dish, that takes 10 minutes to prepare and 15 minutes to cook with a Stove. This recipe serves 16 people.

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1. The localisation of intestinal calcium absorption in the rat was studied by means of radioactive45Calcium. Rats were killed 20, 40, and 60 min after oral administration of45CaCl2-solution.45Ca-acti...

Highly efficient and low cost removal of radioactive 90Sr from high level liquid waste (HLLW) is a key step for safe and long-term storage of nuclear waste. Herein, for the first time, we reported a novel flower-like α-ZrP material, which was prepared via a simple and economical low-temperature solid state s

Mice injected with the bone-seeking isotope, 89Sr, were depleted of marrow erythropoietic progenitor cells but maintained normal or near-normal numbers of splenic erythropoietic progenitor cells, lymphoid tissue alloantigen-sensitive units responsible for graft-vs-host reactions, and splenic antigen-sensitive units responsive to sheep erythrocytes which give rise to antibody-producing cells. The ability of such mice to reject marrow allografts was suppressed. It is concluded that a separate class of marrow-dependent immunocompetent cells exist, now called M cells, which are responsible for rejection of allogeneic dispersed hemopoietic cells.. ...

Sebezhko OI, Petukhov VL, Sokolov VA, Korotkevich OS, Kamaldinov EV, Syso AI, Konovalova TV, Marmuleva NI, Narozhnykh KN, Barinov EY, Osadchuk LV. Comparative assessment of radioactive strontium and cesium contents in the feedstuffs and dairy products from various regions of Western Siberia. Res J Pharm Biol Chem Sci 8(3): 1753-1759, 2017. ...

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High-throughput screening of a library of compounds using an ATP-evoked calcium uptake assay in a stable hP2X4-HEK293 cell line allowed us to identify BX430, a phenylurea endowed with potent (IC50 = 0.54 µM) and selective antagonist properties on recombinant as well as native human P2X4 receptor channels.. Confirming the high calcium permeability of human P2X4 channels reflected by a fractional calcium current close to 15% (Egan and Khakh, 2004), ATP-evoked calcium responses were robust and reproducible, with only a minor contribution by endogenous P2Y receptors in this hP2X4-HEK293 cell line. Therefore, the sensitive screening method described here has the potential to identify novel lead compounds that block P2X4 receptor channels. Moreover, with simple adjustments of the recording parameters, such a calcium-based cellular assay can also be used to screen for positive allosteric modulators of P2X4 function (see Fig. 1B). The blocker BX430, which was selected among other inhibitory lead ...

Its definitely worth making your own corn tortilla chips--these low-fat baked tortilla chips have a more pronounced corn flavor than store-bought tortilla chips.

While many North Americans think of tacos as having crisp, fried shells, authentic Mexican tacos are made with soft, fresh corn tortillas. The traditional preparation is the smart choice, as unfried corn tortillas are low in fat and made with whole grains.

Here in DC, I have had a hard time finding really good corn tortillas, and am exploring making them myself. Does anyone have experience with this, and would you recommend buying a tortilla press, or is covering a cutting board...

A baked dish of browned ground beef, tomatoes and enchilada sauce wrapped in corn tortillas then topped with more enchilada sauce and cheese

Determining calcium bioavailability is important in establishing dietary calcium requirements. In infants and small children, previously conducted mass balance studies have largely been replaced by stable isotope-based studies. The ability to assess calcium absorption using a relatively short 24-hour urine collection without the need for multiple blood samples or fecal collections is a major advantage to this technique. The results of these studies have demonstrated relatively small differences in calcium absorption efficiency between human milk and currently available cow milk-based infant formulas. In older children with a calcium intake typical of Western diets, calcium absorption is adequate to meet bone mineral accretion requirements.

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If you are to look at the ingredients of a standard bag of corn tortillas (Mission brand, for example), lime is often one of the flavoring ingredients. I decided to put my own spin on it by adding some fresh tangelo juice for a hint of sweet goodness in the tortillas. (Tangelos are a cross between tangerines and oranges.) ...

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Although randomized controlled trials have thus far not provided the definitive evidence that low calcium intake is a cause of low 25(OH)D in humans, this is far more likely to be because no trials have adequately addressed the question than because the interaction does not exist. Experimental evidence in rats has demonstrated the interaction beyond doubt, and the physiology - which very clearly implies the interaction - appears to be, for all relevant intents and purposes, identical between humans and rats. It is thus extremely unlikely in my opinion that low calcium intake is not a cause of low 25(OH)D in humans.. The practical implications are two-fold. First, we are in desperate need of clinical trials to address this question adequately. In the mean time, if someone has low 25(OH)D, they should assess their calcium intake.. Obtaining a birds-eye view of ones calcium intake is relatively easy to do without the help of a professional, any fancy software, or even an internet database. Most ...

When I was in my 20s and first living on my own, my apartment was down the street from an amazing little Mexican Taco Stand. I used to eat there at least once a week, and often much more! One of my favorite Tacos was Chorizo and Potato. I dont know why, but I havent had one in years, so I decided to make some. The problem was that I only had a few Corn Tortillas that were a bit dried out so they were only good for chips, so I improvised and ended up making this deconstructed Chorizo and Potato Taco as a soup! Oh my, I was so happy with the flavors of this soup and it was the perfect post-Christmas meal. I made a basic Potato Soup with Onions and Chicken Broth and then cooked the Chorizo on the side and swirled it in when it was done. And, you could easily make it Vegan with Soy Chorizo and Vegetable Broth. I topped it with a quick Pico de Gallo and I crisped up the last few Corn Tortillas in Oil after cutting them in thin little strips. You can easily substitute some crumbled Tortilla Chops It ...

I make tacos almost every week since my husband and I moved from California to New England. I have become quite adept at making corn tortillas...

These soft tacos use lean ground sirloin and low-fat corn tortillas as sensible substitutions. Skip the sour cream and guacamole -- opt for a fiery salsa instead.

Two soft corn tortillas stuffed with sautéed shrimp, tomatoes, onions and topped with cheese sauce. Served with Mexican rice and beans.

Looking for online definition of calcium metabolism in the Medical Dictionary? calcium metabolism explanation free. What is calcium metabolism? Meaning of calcium metabolism medical term. What does calcium metabolism mean?

The effect of 1-alpha-hydroxycholecalciferol and parathyroidectomy on cardiovascular lesions in uraemia: an experimental study in the rat ...

Systemic Radiation Therapy Using radioactive isotopes to treat certain cancers is called systemic radiation therapy. The radioactive isotopes may be swallowed, given intravenously or injected into the body. For example, radioactive iodine (I-131) capsules are given to patients to treat some types of thyroid cancer. Another example is the use of intravenous radioactive strontium to treat pain due to cancer that has spread to the bone. Radioimmunotherapy Recent research has focused on the use of radioactive monoclonal antibodies, also called radiolabeled antibodies, to deliver doses of radiation directly to a tumor. This process is known as radioimmunotherapy. Antibodies are made by the body in response to the presence of antigens (substances recognized as foreign by the immune system). Large quantities of particular types of antibodies, called monoclonal antibodies, can be made in the laboratory. These monoclonal antibodies can be attached to radioactive isotopes in a process called ...

Experienced eaters and chefs alike know that corn tortilla soup traditionally has a thin, spicy broth. If you prefer a thicker soup (not just chunky) with more of a stew or chowder like consistency, any number of thickening methods can be employed without changing the delicious flavor. Corn starch, roux, tapioca flour, arrowroot flour, and potato starch can all be used safely with good results. Tortilla soup can also be reduced down through slow cooking if you hesitate to add additional carbohydrates.. ...

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A healthy, balanced diabetes diet should include plenty of nonstarchy vegetables and moderate amounts of whole grains, fruits, starchy vegetables, lean...

Been taking leftovers for awhile and its getting old. Tired of taking homemade BBQ, chicken breast, hamburgers. I know about corn tortilla roll ups but you ...

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calcium How intracellular Calcium signaling, gradient and its role as a universal intracellular regulator points to design http://reasonandscience.heavenforum

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Calcium is an element is vital for the health of many living things, and has a range of industrial uses. Calcium is never found...

WebMD provides information about interactions between Calcium Creamies Oral and antacids-h2-antagonistsppis-selected-cephalosporins.

Page one so far. Ive still got to tidy it up and add a bit more line work. I am enjoying doing this little project. its a good bi ...