Search results

1

The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler

100%

Błaszczuk A., Nowak W., Jagodzik S.

Archives of Thermodynamics

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2014

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issue 3

2

Nitryle hydrytase ? Ligot activated industrial enzyme

100%

Peplowski L., Kubiak K., Nowak W.

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2007

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issue 1

63-76

EN

Since 1985, nitrile hydratases, metallo-enzymes present in bacteria from genus Rhodococcous, have been used for industrial production of acrylamide and related chemicals. The unique active site of both Fe- and Co-nitrile hydratases contains oxidized cysteines. Despite many efforts, details of the catalytic mechanism of activity and high selectivity remain unknown. Molecular structures, possible routes of hydration and prospects for applications of these photoactive enzymes in nanotechnology are discussed in this review.

3

Effects of different starch sources on metabolic profile, production and fertility parameters in dairy cows

88%

Mikuła R., Nowak W., Jaśkowski J., Maćkowiak P., Oszmałek E.

Polish Journal of Veterinary Sciences

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2011

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issue 1

4

Dynamics of Protein Elements of Hybrid Nanostructures - Molecular Dynamics Simulations of Light Harvesting Peridinin-Chlorophyll a-Protein Model

88%

Jasiński A., Mikulska K., Krajnik B., Mackowski S., Nowak W.

Acta Physica Polonica A

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2012

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vol. 122

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issue 2

284-288

EN

Hybrid nanostructures are often composed of inorganic parts and "biological" ones. Optimized through million years of evolution light harvesting proteins are hard to mimic synthetically. Promising strategy in search for efficient solar cells is an attachment of selected natural protein systems to inorganic quantum dots. Such experimental hybrid structures should have improved charge separation properties. Among the most promising proteins is peridinin-chlorophyll-protein from Amphidinium carterae (PCP). It has a wide absorption spectrum (420-550 nm), optimized for sunlight. The dynamics of this protein, used in modern nanotechnology has been not addressed yet. In this work we present results of PCP computer modeling using a well established molecular dynamics methodology. The CHARMM27 force field parameters were prepared for this protein and all chromophore components. The system was embedded in a box of water, with proper counter ions, and a number of 10 ns molecular dynamics simulations were run using the NAMD code. It has been found that peridinine chromophores exhibit substantial orientational flexibility but a pair Per612 and Per613 is more rigid than the remaining two carotenoids. Orientation and dynamics of absorption and emission electric dipole moments have been also analyzed. Apparently, the architecture of PCP is not optimized for efficient Per-Chl a energy transfer by the Förster mechanism. Several practical issues related to molecular dynamics simulation of similar hybrid nanostructures are discussed.

5

The impact of cow nutrition in the dry period on colostrum quality and immune status of calves

76%

Nowak W., Mikuła R., Zachwieja A., Paczyńska K., Pecka E., Drzazga K., Ślósarz P.

Polish Journal of Veterinary Sciences

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2012

|

issue 1

6

AFM Investigation of Biological Nanostructures

76%

Strzelecki J., Dąbrowski M., Strzelecka J., Tszydel M., Mikulska K., Nowak W., Balter A.

Acta Physica Polonica A

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2012

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vol. 122

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issue 2

329-332

EN

Nanostructures created by living organisms, optimized through millions of years of evolution, can be a valuable inspiration for nanotechnology. We employ atomic force microscopy to examine such structures in materials created by common organisms - caddisfly and diatoms. Caddisfly larvae are well known for their ability to spin silk, which serves as an "adhesive tape" to glue various materials and collect food in aqueous environment. Atomic force microscopy imaging of caddisfly silk, performed for the first time by our team, has shown that its surface is patterned with 150 nm extensions - a feature related to its exceptional underwater sticking abilities. Results of force spectroscopy of protein structures found on the surface are also shown. A characteristic feature of diatoms is that they are encased within a unique silica cell wall called frustules, patterned with 200 nm pores, which allow cellular interaction with the environment. We perform atomic force microscopy imaging of frustules in living diatoms as well as adhesion measurements inside pores.

7

Relationship between pH of ruminal fluid during subacute ruminal acidosis and physiological response of the Polish Holstein-Friesian dairy cows

76%

Stefańska B., Pruszyńska-Oszmałek E., Szczepankiewicz D., Stajek K., Stefański P., Gehrke M., Nowak W.

Polish Journal of Veterinary Sciences

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2017

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issue 3

8

Risk Factors for Wound Dehiscence after Laparotomy – Clinical Control Trial

76%

Kenig J., Richter P., Żurawska S., Lasek A., Zbierska K., Nowak W.

Polish Journal of Surgery

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2012

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vol. 84

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issue 11

565-573

EN

Described in the literature dehiscence rate in the adult population is 0.3-3.5%, and in the elderly group as much as 10%. In about 20-45% evisceration becomes a significant risk factor of death in the perioperative period. The aim of the study was to identify the main risk factors for abdominal wound dehiscence in the adult population. Material and methods. The study included patients treated in the 3rd Department of General Surgery, Jagiellonian University Collegium Medicum in Cracow in the period from January 2008 to December 2011, in which at that time laparotomy was performed and was complicated by wound dehiscence in the postoperative period. For each person in a research group, 3-4 control patient were selected. Selection criteria were corresponding age (± 2-3 years), gender, underlying disease and type of surgery performed. Results. In 56 patients (2.9%) dehiscence occurred in the postoperative period with 25% mortality. The group consisted of 37 men and 19 women with the mean age of 66.8 ± 12.6 years. Univariate analysis showed that chronic steroids use, surgical site infection, anastomotic dehiscence/fistula in the postoperative period and damage to the gastrointestinal tract are statistically significant risk factors for dehiscence. Two first of these factors occurred to be independent risk factors in the multivariate analysis. In addition, due to the selection criteria, a group of risk factors should also include male gender, emergency operation, midline laparotomy, colorectal syrgery and elderly age (> 65 years). Logistic regression analysis did not show that a particular surgeon, time of surgery or a particular month (including holiday months) were statistically significant risk factor for dehiscence. Conclusions. Wound dehiscence is a serious complication with relatively small incidence but also high mortality. Preoperative identification of risk factors allows for a more informed consent before patient’s treatment and to take measures to prevent or minimize the consequences of complication associated with it.

9

Dietary energy density in the dry period on the metabolic status of lactating cows

64%

Nowak W., Mikuła R., Pruszyńska-Oszmałek E., Maćkowiak P., Stefańska B., Kasprowicz-Potocka M., Frankiewicz A., Drzazga K.

Polish Journal of Veterinary Sciences

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2013

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issue 4

Refine search results

The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler

Nitryle hydrytase ? Ligot activated industrial enzyme

Effects of different starch sources on metabolic profile, production and fertility parameters in dairy cows

Dynamics of Protein Elements of Hybrid Nanostructures - Molecular Dynamics Simulations of Light Harvesting Peridinin-Chlorophyll a-Protein Model

The impact of cow nutrition in the dry period on colostrum quality and immune status of calves

AFM Investigation of Biological Nanostructures

Relationship between pH of ruminal fluid during subacute ruminal acidosis and physiological response of the Polish Holstein-Friesian dairy cows

Risk Factors for Wound Dehiscence after Laparotomy – Clinical Control Trial

Dietary energy density in the dry period on the metabolic status of lactating cows