The Crystal Structure of o-Phenylenediamine Hydrochloride.

The Crystal Structure of Terramycin Hydrochloride.

The problem of determining the arrangements of atoms in crystals directly from X-ray diffraction data has engaged the attention of crystallographers for some time, and a number of approaches to this general problem have been presented. We have been especially interested in the approach which makes use of imageseeking functions in solving the Patterson synthesis,' which, in turn, is based entire...

Crystal structure of ciprofloxacin hydrochloride 1.34-hydrate.

Ciprofloxacin belongs to a family of quinolone antibacterial agents. The crystal structure of ciprofloxacin hydrochloride 1,34-hydrate was determined. Most of the bond lengths and angles of the ciprofloxacin cation are very similar to those of ciprofloxacin hexahydrate, which appears in the zwitterionic form. The exceptions are the carbon-oxygen bond distances in the carboxylic group, since in ...

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

EXPEDITED CANCER POTENCY VALUES AND NO SIGNIFICANT RISK LEVELS (NSRLs) FOR FOUR PROPOSITION 65 CARCINOGENS: ISOBUTYL NITRITE, NALIDIXIC ACID, o-PHENYLENEDIAMINE, o-PHENYLENEDIAMINE HYDROCHLORIDE

The Crystal Structure and Absolute Configuration of 2 ' - Deoxycytidine Hydrochloride

2'-Deoxycytidine hydrochloride (C9H14N3Q4Cl) was crystallized from water as monoclinic needles, space group P21, with a=6-561, b= 17·659, c=5·125 A, P= 108·08° and two molecules per cell. The crystal structure has been determined by a three-dimensional X-ray diffraction analysis. A complete hemisphere of data (positive and negative values of both hand k) was collected with a General Electric XR...