catena-Poly[[trimethyl­tin(IV)]-μ-[(E)-2-methyl-3-(3-methyl­phen­yl)acrylato-κ2 O:O′]]

The title trimethyl­tin(IV) carboxyl­ate, [Sn(CH3)3(C11H11O2)]n, is a carboxyl­ate-bridged polymer in which the Sn atom exists in a trans-C3SnO2 trigonal bipyramidal coordination. One Sn—O bond is a covalent bond [2.114 (2) Å], whereas the other is a dative bond [2.607 (2) Å]. The polymeric chain propagates along the b axis of the monoclinic unit cell

Multidisciplinary Management and Outcome of Intradural Extramedullary Spinal Tumors

Introduction/Objective:  About fifteen percent of the primary CNS tumors are intraspinal. About two-thirds of tumors are intradural extramedullary (IDEM). This study was conducted to review the outcome of operative management of intradural extramedullary tumors in correlation with the factors, both clinical & histopathological, influencing the neurology of patients & prognosis. Materials and Methods:  It was a multicenter study including 42 patients conducted from December 2018 to December 2020. All patients were diagnosed by MRI with and without contrast. Patients were surgically treated & analyzed for clinical features i.e., pain by visual analog scale (VAS) & neurology by modified McCormick scale both preoperatively & post-operatively. Clinical features & outcomes were correlated with tumor size & histopathology. p-value < 0.05 was considered significant. Results:  This study included 42 cases. The most common diagnosis was schwannoma (76.19%). The average intradural space occupied at presentation was 82%. The most common location was dorsal (90.4%). The visual analog score for pain (VAS) improved in all patients post-operatively from 7 ± 1.9 to 2 ± 0.8 (p = 0.003) & modified McCormick scale from 3.0 ± 1.3 to 2.0 ± 1.0 (p = 0.005). The preoperative symptoms were correlated with the only size of the tumor occupying the intradural space (VAS p = 0.021, modified McCormick scale p = 0.018). Conclusion:  All the tumors excised showed some improvement in neurological status. Therefore, all patients diagnosed with IDEM should be operated on even if present with prolonged symptoms or severe neurological compromise. Keywords:  Intradural Extramedullary, Meningioma, Schwannoma, Intraspinal

2-(4-Ethoxy­benzyl­idene)butanoic acid

In the crystal structure of the title compound, C13H16O3, dimers are formed due to inter­molecular O—H⋯O hydrogen bonding. There exists an intra­molecular C—H⋯O hydrogen bond which forms a five-membered ring. There is also present a C—H⋯π inter­action between a methyl CH group of an ethyl group and the centroid of the aromatic ring

Bis[2-(3-chloro­benzyl­idene)propanoato-κ2 O,O′]diethyl­tin(IV)

In the mol­ecule of the title compound, [Sn(C2H5)2(C10H8ClO2)2], the Sn atom is six-coordinated in a distorted tetra­gonal–bipyramidal configuration by four O atoms in the equatorial plane and two C atoms in the axial positions. Intra­molecular C—H⋯O hydrogen bonds result in the formation of two planar and two non-planar five-membered rings; the latter adopt envelope conformations. There are weak π–π inter­actions between aromatic rings, with centroid-to-centroid distances of 3.796 (2) and 4.171 (2) Å. There is also a single C—Cl⋯π inter­action [C—Cl = 1.740 (4), Cl⋯π = 3.795 (2) C⋯π = 3.697 (4) Åand C—Cl⋯\p =73.45 (11)°]

3-(4-Chloro­phen­yl)-2-methyl­acrylic acid

In the crystal structure of the title compound, C10H9ClO2, dimers form as a result of inter­molecular O—H⋯O bonding. These dimers are linked to each other via C—H⋯O bonds, where the CH group belongs to the benzene ring and the O atom is from the carbonyl group of an adjacent mol­ecule. There exist two inter­molecular C—H⋯O hydrogen bonds, which individually form five-membered rings. There also exists a π–π inter­action between the aromatic ring and its symmetry counterpart, with a centroid–centroid distance of 4.0202 (17) Å, and a C—H⋯π inter­action between a methyl CH group and the aromatic ring

2-Methyl-3-(3-methyl­phen­yl)acrylic acid

The crystal structure of the title compound, C11H12O2, consists of dimers which are formed due to inter­molecular O—H⋯O hydrogen bonding. The dimers are linked to each other by C—H⋯O hydrogen bonds, where C—H belongs to the benzene ring and the O atom is of a carbonyl group of an adjoining mol­ecule. There exist two inter­molecular C—H⋯O hydrogen bonds which form five-membered rings. There exist two π–π inter­actions between the benzene rings. The perpendicular distance in these inter­actions are 3.006 and 3.396 Å. There also exist C—H⋯π and C—O⋯π inter­actions

2-(4-Isopropyl­benzylidene)propanoic acid

The two mol­ecules in the asymmetric unit of the title compound, C13H16O2, form dimers through O—H⋯O hydrogen bonding, resulting in R 2 2(8) rings. Each carboxyl­ O atom is involved in inter­amolecular C—H⋯O hydrogen bonds, forming five-membered rings. There exist dissimilar dihedral angles within the two mol­ecules, for example the carboxylate and isopropyl groups make dihedral angles of 59.6 (4) and 71.7 (3)° in the two molecules. There are no intermolecular π inter­actions

Distribution of Radiation in Erbil city

Background: Radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium. This includes electro-magnetic radiation such as radio waves, visible light, and x-rays, particle radiation such as α, β, and neutron radiation and acoustic radiation such as ultrasound, sound, and seismic waves. Radiation may also refer to the energy, waves, or particles being radiated. Some studies design to estimate the distribution of radiation in different streets and effect on health environment.   Objectives: To determine the magnitude of radiation in different streets in Erbil city and demonstrate the difference between them. Methods and Materials: Palm RAD meter-nuclear radiation meter at Model-907) was used for investigation of radiation in different streets in Erbil city like (around citadel, 30m, 60m, 40m and 100m) A nuclear radiation meter is an instrument measures the nuclear radiation. In other hands it is used to detect  the radiation in the spaces near the sources of radiation like (X-ray, CT-Scanner and others) at streets of Hospital, centers of bone fracture imaging  are transmitted where nuclear radiation and x-ray radiation to the outside to the environment surrounding radiation sources. Which induces biological effects is more than standard value. Results: The results showed that the nuclear radiation at small dose is present and detected in the different streets in Erbil city, but  more dose are detected  in the space near sources of radiation which are mentioned in the previous words. This increasing of nuclear radiation which is caused by  sources of radiation like (X-ray, CT-Scanner,  and the bomb of USA) included to biological and physiological effects on the people in Erbil city who are sting and working near these places is showed by statistical test.  Conclusion: Distribution of radiation is dependent on the sources of radiations doses, and discussing that to investigate how this radiation affects the physiology of human body and showing the disadvantage of increasing and decreasing of radiation with the location of people

(E)-2-(2-Fluoro­benzyl­idene)butanoic acid

In the crystal structure of the title compound, C11H11FO2, the methine CH forms an intra­molecular hydrogen bond with the carboxyl­ O atom. The mol­ecules form dimers through hydrogen bonding between carboxyl­ groups. These dimers are linked to each other by C—H⋯O contacts between the benzene and carbonyl groups of adjoining mol­ecules. In addition, there are weak inter­molecular C—H⋯F contacts

4-(4-Methoxy­phen­yl)piperazin-1-ium chloride

In the title compound, C11H17N2O+·Cl−, the dihedral angle between the benzene ring and the basal plane of piperazine ring is 39.20 (8)°. In the crystal, intermolecular N—H⋯Cl hydrogen bonds occur. There is also a C—H⋯π inter­action between the benzene rings