Aging, LABs

Odetti P, Pronzato MA, Noberasco G, Cosso L, Traverso N, Cottalasso D and Marinari UM (1994) Relationships between glycation and oxidation related fluorescences in rat collagen during aging. Lab Invest 70, 61-67. 

H. Vlassara, R. Bucala, and L. Striker, Pathogenic effects of advanced glycosylation Biochemical, biologic and clinical implications for diabetes and aging, Lab. Invest., 1994, 70, 138-151. 

R-Factor data for phenoHc suppHed by Manvike source for all other R-factors is The Dow Chemical Company. Units of R-factor are (W-cm)/hm -K (= 1.4 Btu-in./h-sq ft°F). R-Value per cm of thickness is the R-factor. R- and R-factors can vary with age and use conditions. Values shown are averages obtained from lab samples. 

At the age of sixteen, Townes entered Furman University and received two bachelor s degi ees (modern languages and physics) in 193.S. He continued his education, receiving a master s at Uuke University in 1937 and a doctorate at Cal Tech in 1939. In the summer of 1939, Bell Labs hired him. Numerous lines of research were being undertaken simultaneously at Bell Labs. Most of the work done by Townes initially dealt with basic research and the transmission of telephone and television signals. Worldwide political events, however, soon changed this emphasis. 

The formed anhydride can be transformed to the desired LAB during aging and notably during the hydrolysis step (stabilization). 

Insufficient aging. Sulfonic anhydride is reacting with H2S04 and LAB, forming LAS (see before). Insufficient aging will leave this reaction incomplete. 

Sulfonation of the common feedstocks proceeds with a highly exothermic instantaneous initial reaction, followed by a fast but not instant step that is also highly exothermic. The second reaction does not always proceed to completion (e.g., LAB, FAME) in the lower zone of a short residence time falling film reactor (FFR). For these organic feedstocks aging under well-defined conditions of temperature and reaction time is required. 

A rabbit model of 2, 3 -dideoxycytidine neurotoxicity. Lab Invest 66(l) 63-74 Apostolski S, McAlarney T et al (1993) The gpl20 glycoprotein of human immunodeficiency virus type 1 binds to sensory ganghon neurons. Ann Neurol 34(6) 855-863 Araujo AP, Nascimento OJ et al (2000) Distal sensory polyneuropathy in a cohort of HIV-infected children over five years of age. Pediatrics 106(3) E35 Authier FJ, Gheradi RK (2003) Peripheral neuropathies in HIV-infected patients in the era of HAART. Brain Pathol 13(2) 223-228... 

The plum pudding structure of the atom was short-lived. It was disproved by Ernest Rutherford, one of Thomsons best students. Rutherford was an unlikely scientist. He was born and raised in rural New Zealand, about as far as you can get from the worlds scientific centers. He became interested in science while in elementary school. He did well at it immediately, winning scholarship after scholarship and degree after degree, all in physics or mathematics. At age 23, Rutherford got the job he wanted. He was awarded a fellowship to study at Cambridge. He elected to work with J.J. Thomson at the Cavendish Laboratory, the most advanced physics lab in the world. 

The Zag meteorite fell in the western Sahara of Morocco in August 1998. This meteorite was unusual in that it contained small crystals of halite (table salt), which experts believe formed by the evaporation of brine (salt water). It is one of the few indications that liquid water, which is essential for the development of life, may have existed in the early solar system. The halite crystals in the meteorite had a remarkably high abundance of 128Xe, a decay product of a short-lived iodine isotope that has long been absent from the solar system. Scientists believe that the iodine existed when the halite crystals formed. The xenon formed when this iodine decayed. For this reason, the Zag meteorite is believed to be one of the oldest artifacts in the solar system. In this lab, you will use potassium-argon radiochemical dating to estimate the age of the Zag meteorite and the solar system. 

Scott, F..I., LIMS comes of age Realistic appraisals and enterprise-wide prospects—LIMS 12 The 12th International LIMS Conference, Am. Lab. News, 31(7), 4, 1999. 

Lab Test Units Sex Low Age High Age Low Normal High Normal... 

Let us say the first three samples tested were collected by Lab 2 from their production facility. These samples were retained from actual production lots. An aliquot from each retained jar was removed and shipped to Lab 1 in appropriate sealed containers. METHOD B testing was started at both laboratories the day following receipt of the samples to rule out any possible aging effects. METHOD A testing was performed in Lab 1 on the following day, while the METHOD A testing in Lab 2 occurred a week later. 

More recently, Robert A. Nelson s collection, Adept Alchemy (1998), continues to assert alchemy s scientific validity and its relationship to modem atomic science. Nelson s anthology intends to help alchemists working in the so-called dry path to transmutation. It includes extracts and summaries of work from the Middle Ages through the late twentieth century by Hermetic alchemists, chemists, and physicists, including the 1980 transmutation of bismuth into gold by scientists at the Lawrence Berkeley lab. (Nelson also includes the more controversial methods of Joe Champion in the 1990s. Champion was convicted of fraud in Arizona because he had not produced the results he claimed for investors.) Across the century, then, followers of occult alchemy have clearly continued to make connections to modern atomic science. 

A summary of the report follows The problem is to separate proteins. Furthermore, SpinPro should pay particular attention to the purity of the separation. The sample is not negatively affected by sucrose, has a sedimentation coefficient of 16 Svedbergs, and is in liquid form of 3 mL and a concentration of 1% w/w. The protein of interest should be placed 45% from the top of the gradient at the end of the run. Of the gradient concentrations 10-40% and 5-20%, the 10-40% is preferred by the investigator. There are no solvents in the sample that are harmful to the tubes. Finally, from the lab, SpinPro should use the L2-75B ultracentrifuge and the SW 41 Ti rotor, which does not require a speed derating due to its age. 

Females of the potato aphid Macrosiphum euphorbiae produced (17 , aS, IS, 7 7 )-nepetalactol and (4a5, 75, 7a7 )-nepetalactone in ratios that varied with age from 4 1 to 2 1. Males did not respond to either of the components when presented alone. However, the 5 1 ratio, which proved quite attractive in lab tests, was not as effective during three years of field trials. ... 

In general, although proper metal aging is still an open issue, it seems that severe hydrothermal conditions during ReDox cycles with an emphasized reducing step is the direction to optimization of the artificial deactivation methods. The development of such a simulative lab-deactivation protocol will undoubtedly be very essential and a major contribution in the FCC research field. 

You can substitute someone else s urine. Ask your urine donor (hopefully a friend you can trust) what drugs they ve taken in the last month. They may have taken a false positive (or a true positive for that matter). Before the test, the examiner will likely ask you to list everything you ve taken. If the urine ages beyond 18 hours, deterioration becomes noticable and the lab may suspect something. 

If you don t trust your friend s sample, or don t have any clean friends, you can get powdered urine from Martha Butterfield-Jay Foundation. It s produced by Byrd Labs, and supposedly works perfectly however, I got MBJF s powdered urine, and it did not specify the age or gender of the original sample. Powdered urine must be prepared ahead of time. If there is a period of time that you are clean, you can make powdered urine from your own supply. 

Aging behavior observed in the mean square displacement, (Ax ), as a function of time for different ages. The colloidal system reorganizes slower as it becomes older, (c) y = (Ax )/3 (upper curve) and (Ax ) (lower curve) as a function of the age measured over a fixed time window At = 10 min. For a diffusive dynamics both curves should coincide, however these measurements show deviations from diffusive dynamics as well as intermittent behavior. Panels (a) and (b) from http // www.physics.emory.edu/ weeks/lab/aging.html and Panel (c) from Refill. 

---