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Acarologia ◽  
2021 ◽  
Vol 61 (2) ◽  
pp. 412-431
Author(s):  
Andrey B. Shatrov ◽  
Anastasia A. Antonovskaia

Stylostome and skin inflammatory reaction during feeding of Neotrombicula talmiensis (Schluger, 1955) (Acariformes, Trombiculidae) larvae on the naturally infected host animals – voles Myodes rufocanus Sundevall, 1846 and Asian chipmunk Tamias sibiricus (Laxmann, 1769) were studied by histological methods. In addition, larvae were studied in scanning electron microscope (SEM). The apical hypostomal portions form a temporal sucker, which applies to the host skin during feeding. Larval feeding on both naturally infected voles and chipmunks causes an epidermal hyperkeratosis and a permanent delayed inflammation with predominance of neutrophil leukocytes, dilation of dermal capillaries and local hemorrhages. Larvae tend to feed in tight groups and may attach themselves to both ‘living’ epidermis and hypertrophic stratum corneum. The stylostome is organized nearly identically in the two host species, which points to the species-specific character of the feeding tube in trombiculid larvae. The stylostome does not penetrate the epidermis through, so it may be classified as belonging to the epidermal type. The stylostome is produced by a solidifying larval secretion and composed of the proximal eosinophil cone and the main stylostome tube, both pale-pink in azure-II-eosin with a greyish peripheral portion more pronounced in voles. No longitudinal and transverse stratification is found in the stylostome composition. In contrast with other trombiculid larvae studied so far, larvae of N. talmiensis also ingest, besides liquefied nutrients, a pure blood that reveals a possibility for trombiculid larvae to be natural bloodsuckers.


2020 ◽  
Vol 1 (3) ◽  
pp. 158-168
Author(s):  
Peilin Zhang

Decidual vasculopathy at late gestation was shown to be associated with spiral artery remodeling at implantation. Dramatic decidual vascular transformation from early to late stage pregnancy suggests a dynamic spatiotemporal relationship between the various vascular components in spiral artery remodeling and decidual vasculopathy. The central and peripheral portions of 105 placentas with decidual vasculopathy at term were examined with or without preeclampsia to see if temporal vascular regeneration was present. Central and peripheral vasculopathy and central and peripheral regeneration were compared. The peripheral portion showed more decidual vasculopathy (88 of total 105, 83.8%) than central portion (72 of total 105, 68.6%, p < 0.0001). However, central portion showed more vascular regeneration (51 of total 105, 48.6%) than the peripheral portion (23 of total 105, 21.9%, p < 0.0001). There was no difference in vasculopathy or regeneration with or without preeclampsia. Spiral artery remodeling is non-synchronous during placental growth and vascular regeneration. This spatiotemporal sequence may help interpretation of morphologic changes of decidual vasculopathy.


2020 ◽  
Author(s):  
Peilin Zhang

AbstractBackgroundDecidual vasculopathy at late gestation was shown to be associated with spiral artery remodeling at implantation. How placental lateral growth is related to spiral artery remodeling in spatiotemporal fashion is to be investigated.DesignThe central and peripheral portions of 105 placentas with decidual vasculopathy at term were examined with or without preeclampsia to see if temporal vascular regeneration was present. Central and peripheral vasculopathy and central and peripheral regeneration were compared.ResultPeripheral portion showed more decidual vasculopathy (88 of total 105, 83.8%) than central portion (72 of total 105, 68.6%, p=0.0018). However, central portion showed more vascular regeneration (51 of total 105, 48.6%) than peripheral portion (23 of total 105, 21.9%, p=0.0024). There is no difference in vasculopathy or regeneration with or without preeclampsia.ConclusionSpiral artery remodeling is non-synchronous during lateral growth and vascular regeneration. This spatiotemporal sequence may help interpretation of morphologic changes of decidual vasculopathy.


Author(s):  
Игорь Семикопенко ◽  
Igor' Semikopenko ◽  
Сергей Латышев ◽  
Sergey Latyshev ◽  
Виталий Воронов ◽  
...  

2015 ◽  
Vol 5 (2) ◽  
pp. 110-119
Author(s):  
Дербин ◽  
Mikhail Derbin ◽  
Дербин ◽  
Vasiliy Derbin

There are various ways of supply water to peripheral portion of the saw, but they have some significant disadvantages which complicate their use. Proposed to use for cooling of circular saws aerostatic directing. Due to a dramatic expansion of air around saw can be achieve a reduction of temperatures gradient. In metallurgy extensively used various jet systems for cooling and heating the metal. Existing research in metallurgy can not be applied to the aerostatic directing because of significant differences in their design and parameters. The paper proposes a method of performing research cooling ability aerostatic supports.


CytoJournal ◽  
2012 ◽  
Vol 9 ◽  
pp. 4 ◽  
Author(s):  
Cherry Bansal ◽  
U. S. Singh ◽  
Sanjeev Misra ◽  
Kiran Lata Sharma ◽  
Vandana Tiwari ◽  
...  

Background: Fine needle aspiration (FNA) is a quick, minimally invasive procedure for evaluation of breast tumors. The Scarff-Bloom-Richardson (SBR) grade on histological sections is a well-established tool to guide selection of adjuvant systemic therapy. Grade evaluation is possible on cytology smears to avoid and minimize the morbidity associated with overtreatment of lower grade tumors. Aim: The aim was to test the hypothesis whether breast FNA from the peripheral portion of the lesion is representative of Scarff-Bloom-Richardson grade on histopathology as compared to FNA from the central portion. Materials and Methods: Fine-needle aspirates and subsequent tissue specimens from 45 women with ductal carcinoma (not otherwise specified) were studied. FNAs were performed under ultrasound guidance from the central as well as the peripheral third of the lesion for each case avoiding areas of necrosis/calcification. The SBR grading was compared on alcohol fixed aspirates and tissue sections for each case. Results: Comparative analysis of SBR grade on aspirates from the peripheral portion and histopathology by the Pearson chi-square test (χ2 =78.00) showed that it was statistically significant (P<0.001) with 93% concordance. Lower mitotic score on aspirates from the peripheral portion was observed in only 4 out of 45 (9%) cases. The results of the Pearson chi-square test (χ2 = 75.824) with statistically significant (P=0.000). Conclusion: This prospective study shows that FNA smears from the peripheral portion of the lesion are representative of the grading performed on the corresponding histopathological sections. It is possible to score and grade by SBR system on FNA smears.


Hand Surgery ◽  
2012 ◽  
Vol 17 (01) ◽  
pp. 71-75 ◽  
Author(s):  
Yuki Matsushita ◽  
Masao Fujiwara ◽  
Takeshi Nagata ◽  
Tatsuya Noda ◽  
Hidekazu Fukamizu

We recently developed continuous negative pressure therapy with irrigation (NPI) and successfully applied it to an infected digit with a narrow wound. With this technique, however, the dressing circumferentially wraps the digit or hand, and the pressure that the digit or hand receives and the influence on peripheral circulation are unclear. In this report, we evaluated the external pressure that a digit and hand received during NPI in vitro. Under circumferential NPI dressing, the skin perfusion pressure (SPP) of the peripheral portion was measured. Pressure was maintained at 1.3 mm Hg, and suction pressure ranged from -50 to -200 mm Hg. The pressure that a digit or hand receives during NPI is much lower than that at which tissue may be damaged (40–50 mm Hg). The SPP of the peripheral portion was much higher than 40 mm Hg, which is the pressure at which wound healing may be predicted. In clinical cases, NPI has been useful for wound bed preparation.


2001 ◽  
Vol 125 (11) ◽  
pp. 1494-1496
Author(s):  
Ravindra Veeramachaneni ◽  
Janis Gulick ◽  
Ari O. Halldorsson ◽  
Thanh T. Van ◽  
Ping L. Zhang ◽  
...  

Abstract This report describes a benign myoepithelioma of the lung that occurred in a 60-year-old woman. The patient had experienced hoarseness for 6 weeks, and a computed tomographic scan showed a nodule of approximately 2 cm in diameter at the peripheral portion of her right upper lung. Positron emission tomography showed no uptake of F-18 fluorodeoxyglucose in the nodule. Wedge biopsy of the lesion showed benign spindle cells arranged in a whorled pattern. The cells were positive for both cytokeratin and smooth muscle actin, which corresponded to the presence of tonofilaments and myofilaments that were identified ultrastructurally. The features of the present case of benign myoepithelioma that differ from features of previously reported benign and malignant cases of myoepithelioma in the lung are discussed in the report.


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