Hóa chất bổ trợ là gì? Các công bố khoa học về Hóa chất bổ trợ

Hóa chất bổ trợ là các chất hóa học được sử dụng để cung cấp các chất dinh dưỡng, chất kích thích, hoặc các thành phần khác nhằm nâng cao hiệu quả và tăng cường hoạt động của một quá trình hoặc sản phẩm nào đó. Các hóa chất bổ trợ thường được sử dụng trong nông nghiệp, thực phẩm, y học, công nghệ sinh học và nhiều lĩnh vực khác để cải thiện tác động của chúng.
Hóa chất bổ trợ được sử dụng trong nhiều ngành công nghiệp và lĩnh vực khác nhau để cung cấp các chất dinh dưỡng, tái tạo và tăng cường các quá trình hoạt động. Dưới đây là một số ví dụ về các loại hóa chất bổ trợ trong một số lĩnh vực:

1. Nông nghiệp: Trong nông nghiệp, hóa chất bổ trợ có thể là các phân bón chứa các chất dinh dưỡng như nitơ, fosfor, kali, khoáng chất và vi lượng cần thiết cho sự phát triển và sinh trưởng của cây trồng. Các hợp chất chelate cũng được sử dụng để cải thiện khả năng hấp thụ và sử dụng chất dinh dưỡng của cây trồng.

2. Thực phẩm: Hóa chất bổ trợ trong ngành thực phẩm được sử dụng để cải thiện chất lượng và tính ổn định của sản phẩm thực phẩm. Ví dụ, chất phụ gia như chất chống oxy hóa, chất chống ẩm, chất tạo đặc, chất điều chỉnh độ acid... được sử dụng để tăng cường độ ổn định, gia tăng thời gian bảo quản và tạo ra cấu trúc, hương vị và màu sắc tốt hơn.

3. Y học: Trong y học, hóa chất bổ trợ có thể là dược phẩm bổ sung, vitamin, axit amin, chất kích thích miễn dịch như thuốc tăng cường sức đề kháng, thuốc bổ dưỡng sắt, thuốc chống oxi hoá... Được sử dụng để bổ sung các chất cần thiết cho sự phát triển, trị liệu và bảo vệ sức khỏe con người.

4. Công nghệ sinh học: Trong lĩnh vực công nghệ sinh học, hóa chất bổ trợ được sử dụng để tạo ra môi trường tốt nhất cho vi sinh vật và các quá trình sinh học khác. Ví dụ, các chất tăng sinh, chất chống vi khuẩn, chất điều chỉnh pH... được sử dụng trong nuôi cấy tế bào, sản xuất protein và các sản phẩm sinh học khác.

Như vậy, hóa chất bổ trợ có thể được hiểu là các chất được sử dụng để cung cấp các chất dinh dưỡng, kích thích hoặc tái tạo cần thiết trong các quá trình hoạt động của các ngành công nghiệp và lĩnh vực khác nhau.

Danh sách công bố khoa học về chủ đề "hóa chất bổ trợ":

Pain biology education and exercise classes compared to pain biology education alone for individuals with chronic low back pain: A pilot randomised controlled trial
Manual Therapy - - Trang 382-387 - 2010
Cormac G. Ryan, Heather G. Gray, Mary Newton, Malcolm H. Granat
Synthesis of new sulfonate and phosphonate derivatives for cation-independent mannose 6-phosphate receptor targeting
Bioorganic and Medicinal Chemistry Letters - - Trang 6240-6243 - 2008
Audrey Jeanjean, Magali Gary-Bobo, Philippe Nirdé, Simon Leiris, Marcel Garcia, Alain Morère
Children's sensitivity to authenticity in their extension of brand names
Cognitive Development - - Trang 101314 - 2023
D. Geoffrey Hall, Alexandria Sowden, Erica Dharmawan
The difficult healing of segmental fractures of the tibial shaft
Archives of Orthopaedic and Trauma Surgery - - Trang 238-242 - 1989
P. M. Rommens, W. Coosemans, P. L. O. Broos
Segmental fractures of the tibial shaft are always caused by a high-energy direct trauma. They are frequently associated with important soft tissue injuries, and the vascularization of the intermediate bone fragment is severely disturbed. The postoperative problems of 40 patients with 41 segmental tibial shaft fractures were reviewed. Twenty-three fractures (56.1%) were treated with a plate osteosynthesis, 18 (43.9%) with an external fixator. Thirty-seven fractures could be followed-up until bony consolidation. Bone-healing problems were seen in 29%, always in the distal fracture. A good functional result, could be obtained in 78.4%. The problems of each stabilization method are discussed. The vascularization of the intermediate segment may not be endangered secondarily by the stabilization procedure.
Sternal defects
Pediatric Surgery International - - Trang 156-164 - 1990
Robert C. Shamberger, Kenneth J. Welch
Sternal defects comprise a broad spectrum of deformities of the sternum, heart, and upper abdominal wall. We have reviewed our experience with sternal defects at the Children's Hospital of Boston and reviewed the world literature to present a current classification of these deformities and summarize frequently associated lesions and their therapeutic implications. Sixteen patients with sternal defects were identified in our series, 5 with thoracic ectopia cordis with a completely naked heart, 8 with thoracoabdominal ectopia cordis with a covered heart, and 3 with a cleft sternum. Thoracic ectopia cordis was uniformly fatal in our series, as it has been in all except 3 cases in the world literature, all with normal hearts. Thoracoabdominal ectopia cordis was fatal in 5 of 8 cases in our series related primarily to associated pulmonary hypoplasia or intrinsic cardiac anomalies. Bifid sternum was successfully repaired in all 3 cases in infancy.
Powdery mildew resistance in barley landrace material. I. Screening for resistance
Euphytica - - Trang 227-233 - 1997
J. Helms Jørgensen, H.P. Jensen
A total of 4,681 accessions of Hordeum vulgare landrace material from Ethiopia, East Mediterranean, Near East, Nepal and China were sown in the field and subjected to the natural powdery mildew epidemic in Denmark. Apparently resistant accessions were selected. Selfed progeny from them were retested and reselected in subsequent years at four locations in Denmark. Finally, 16 promising donors of resistance were retained. They were characterized in the field and tested in the seedling stage for reaction to up to 72 different isolates of the powdery mildew fungus. The absence of the corresponding virulences in the Danish airborne powdery mildew population was ascertained in five years. The resistances in the 16 donors are apparently mutually different and from known sources of powdery mildew resistance in barley.
Revisiting the Historical Use of the Assessment Centre in Management Selection and Development
Emerald - - Trang 5-13 - 1991
George Munchus, Barbara McArthur
The assessment centre method has received considerable historical attention as an effective tool for management selection and development. The method, originally developed by German psychologists, was used extensively during World War II by the Office of Strategic Services. Refinement of the method occurred at the American Telephone and Telegraph Company during the mid‐1950s in the Management Progress Study under the leadership of Dr Douglas W. Bray. The method found increased acceptance due, in part, to court decisions finding it in compliance with EEOC guidelines. The process used proposes to evaluate the relative strength within an individual of up to ten personality traits using exercises simulating job conditions and events. Studies performed years after assessment show impressive figures regarding the method′s ability to predict management success. Continuing research has shown a use for this method at all levels within an organisation.
Diabetic Ketoacidosis in Type 2 Diabetics: A Novel Presentation of Pancreatic Adenocarcinoma
Journal of General Internal Medicine - - Trang 369-373 - 2010
Ming Valerie Lin, Gene Bishop, Maria Benito-Herrero
Diabetic ketoacidosis (DKA) has been the hallmark of a life-threatening medical emergency for poorly controlled or newly diagnosed type 1 diabetics. In the last two decades, this traditional association has been challenged with increasing reports of type 2 diabetics presenting with DKA. We report the case of a 75-year-old woman with known type 2 diabetes who presented in DKA and was found to have pancreatic adenocarcinoma. A link between diabetes mellitus and pancreatic cancer has been investigated, but the literature remains inconclusive as to whether diabetes mellitus (DM) is a cause or result of pancreatic cancer or simply the confluence of two common entities. Previous case reports of pancreatic tumors presenting with DKA all represented neuroendocrine tumors. Adenocarcinoma of the pancreas should be considered in the list of precipitants for DKA in type 2 DM.
Surgical Management of Early-Stage Esophageal Adenocarcinoma Based on Lymph Node Metastasis Risk
Annals of Surgical Oncology - - Trang 318-325 - 2017
Andrew D. Newton, Jarrod D. Predina, Leilei Xia, Robert E. Roses, Giorgos C. Karakousis, Daniel T. Dempsey, Noel N. Williams, John C. Kucharczuk, Sunil Singhal
In early-stage esophageal adenocarcinoma (EAC), esophagectomy improves staging but also increases mortality compared with endoscopic resection. Our objective was to quantify esophagectomy mortality and lymph node metastasis (LNM) risk in early-stage EAC to improve surgical treatment allocation. We identified National Cancer Database (2004–2014) patients with nonmetastatic, Tis, T1a, or T1b EAC who had primary surgical resection and microscopic examination of at least 15 lymph nodes. Univariate and multivariable logistic regression identified predictors of LNM. Cox regression identified predictors of death. The Kaplan–Meier method predicted overall survival (OS). In 782 patients, LNM rates were: all patients 13.8%, Tis 0%, T1a 3.6%, T1b 23.4%. Independent predictors of LNM were submucosal invasion, lymphovascular invasion (LVI), decreasing differentiation, and tumor size ≥ 2 cm (P < 0.05). For T1a tumors with poor differentiation or size ≥ 2 cm, LNM rates were 10.2 and 6.7%, respectively; 90-day mortality was 3.1%. The LNM rate in well differentiated T1b tumors < 2 cm was 4.2%; 90-day mortality was 6.0%. Estimated 5-year OS was 80.2% versus 64.4% (T1a vs. T1b). LNM increased risk of death for T1a (hazard ratio [HR] 8.52, 95% confidence interval [CI] 3.13–23.22, P < 0.001) and T1b tumors (HR 2.52, 95% CI 1.59–4.00, P < 0.001). In T1a EAC with poor differentiation or size ≥ 2 cm, esophagectomy should be considered, whereas in T1b EAC with low-risk features (well-differentiated T1b EAC < 2 cm without LVI), endoscopic resection may be sufficient. Treatment guidelines for early-stage EAC should include all high-risk tumor features for LNM and stage-specific esophagectomy mortality.
Designer landscapes for sustainable biofuels
Trends in Ecology and Evolution - - Trang 431-438 - 2009
Lian Pin Koh, Patrice Levang, Jaboury Ghazoul
Tổng số: 2,324,402   
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 232441