Global folding of proteins using a limited number of distance constraints

A Monte Carlo method is presented which can obtain the correcttertiary fold of a protein given the secondary structure andas few as three interactions between each secondary structureunit. This method was used to fold hemerythrin, Qavodoxin, bovinepancreatic trypsin inhibitor and a variable light domain froman immunoglobulin using the known secondary structures of theseproteins. Each of the proteins was successfully folded to obtaina structure resembling the initial X-ray structure. Reasonablesuccess was also achieved when using a secondary structure predictionalgorithm to assign secondary structure. The r.m.s. deviationsbetween the folded proteins and the crystal structures are inthe order of 3–5 A for the backbone coordinates. Evaluationof the r.m.s. deviations between members of the globin familyindicates that two equivalent overall folds may have r.m.s.deviations of this or even larger magnitude. The limiting numberof constraints necesssary to achieve the correct fold is discussed.     

The design and operation of an industrial beam transport system for15-30 MeV protons

An automated beam transport system that improves the operation of an industrial radioisotope production facility by incorporating features that enhance both the reliability of operation and the ease of maintenance in a radiation environment is described. The theoretical and practical aspects of the optical design, the diagnostic and protection equipment, the vacuum components, and the control and operation of the beamline are covered. Future work is discussed, and conclusions are given     

Selective molecular recognition, C-H bond activation, and catalysis in nanoscale reaction vessels

Supramolecular chemistry represents a way to mimic enzyme reactivity by using specially designed container molecules. We have shown that a chiral self-assembled M4L6 supramolecular tetrahedron can encapsulate a variety of cationic guests with varying degrees of stereoselectivity. Reactive iridium guests can be encapsulated, and the C-H bond activation of aldehydes occurs with the host cavity controlling the ability of substrates to interact with the metal center based upon size and shape. In addition, the host container can act as a catalyst by itself. By restricting reaction space and preorganizing the substrates into reactive conformations, it accelerates the sigmatropic rearrangement of enammonium cations.     

Cystic changes in the lungs in childhood (author's transl)

Two boys with presumably congenital cystic changes in the lungs are described. In one child multiple cystic deformations led to acute symptoms of severe respiratory distress necessitating urgent resection of the right middle and upper lobes. The other boy had a large thick-walled cyst in the left upper lobe causing no distress whatsoever. This patient was observed for more than 6 years before operation. Multiple vascular anomalies and anastomoses were revealed during surgery. Both cases are presented in detail and the completely different clinical course is outlined. Only when careful supervision of intrapulmonary cystic changes is guaranteed can operation be postponed for longer than 6 months. Pulmonary cysts may lead to emergency procedures. They are always a potential source of serious complications such as rupture or infection. When no tendency for regression can be discovered surgical removal is indicated. Conservative treatment will not influence the course. Differential diagnosis is discussed briefly.     

Oncotic aneurysm. Case report

The author describes a case of intracerebral and subarachnoid hemorrhage associated with an intracranial aneurysm caused by a metastatic tumor. The aneurysm formation is explained as being result of tumor cells invading the vessel wall while still preserving the arterial circulation.     

Recommended standards for gamma-ray energy calibration (1979)

A consistent set of γ-ray energies, all with uncertainties of at most 10 ppm, is recommended for use in the energy calibration of γ-ray spectra. Almost all γ rays listed are from commercially available sources. The half-lives of the isotopes selected are generally at least 30 days. The γ-ray energies, in the range E_γ = 60–6100 keV, are all based on the value of 411 804.4 ± 1.1 eV for the γ-ray from the decay of ¹⁹⁸Au. The energy of the 6129-keV line in ¹⁶O, which is the γ-ray with the highest energy of the present set, has also been measured relative to another standard; the two values are consistent.     

Schizophrenic patients in the psychiatric interview: An experimental study of their effectiveness at manipulation.

This study attempted to examine whether chronic schizophrenic patients could effectively engage in the manipulative strategy of impression management in an evaluative interview situation. The data supported the expectation that schizophrenic mental patients can effectively present themselves as "sick" or "healthy," whichever is more suited to their needs and goals. Thus, when the patients' open ward status was questioned, they convincingly presented themselves in the interview as "healthy" and eligible for open ward living; when their residency status was questioned, they convincingly presented themselves as "sick" and ineligible for discharge. These findings were interpreted as supporting assumptions of patient effectiveness in implementing goals. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Methodische Untersuchungen zur phasentrennenden Fraktionierung von Polycaprolactam,

The carbonyl group concentration was determined with C-14 labelled 2,4-dinitrophenylhydrazine in the following substances: pergamin, filterpaper, cellophane, polyethylene and polypropylen. For standardizing the method, the MALAPRADE-splitting of the C₂? C₃-bond in the glucosidic unit of celluloses was used. The reactivity towards NaJO₄ increased in the following way: cellophane < filterpaper < pergamin.